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Bereczki F, Turbucz M, Pokorni AJ, Hajnal B, Ronai M, Klemencsics I, Lazary A, Eltes PE. The effect of polymethylmethacrylate augmentation on the primary stability of stand-alone implant construct versus posterior stabilization in oblique lumbar interbody fusion with osteoporotic bone quality- a finite element study. Spine J 2024; 24:1323-1333. [PMID: 38307174 DOI: 10.1016/j.spinee.2024.01.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/08/2023] [Revised: 01/26/2024] [Accepted: 01/27/2024] [Indexed: 02/04/2024]
Abstract
BACKGROUND CONTEXT Oblique lumbar interbody fusion (OLIF) can provide an ideal minimally invasive solution for achieving spinal fusion in an older, more frail population where decreased bone quality can be a limiting factor. Stabilization can be achieved with bilateral pedicle screws (BPS), which require additional incisions and longer operative time. Alternatively, a novel self-anchoring stand-alone lateral plate system (SSA) can be used, where no additional incisions are required. Based on the relevant literature, BPS constructs provide greater primary biomechanical stability compared to lateral plate constructs, including SSA. This difference is further increased by osteoporosis. Screw augmentation in spinal fusion surgeries is commonly used; however, in the case of OLIF, it is a fairly new concept, lacking a consensus-based guideline. PURPOSE This comparative finite element (FE) study aimed to investigate the effect of PMMA screw augmentation on the primary stability of a stand-alone implant construct versus posterior stabilization in OLIF with osteoporotic bone quality. STUDY DESIGN The biomechanical effect of screw augmentation was studied inside an in-silico environment using computer-aided FE analysis. METHODS A previously validated and published L2-L4 FE model with normal and osteoporotic bone material properties was used. Geometries based on the OLIF implants (BPS, SSA) were created and placed inside the L3-L4 motion segment with increasing volumes (1-6 cm3) of PMMA augmentation. A follower load of 400 N and 10 Nm bending moment (in the three anatomical planes) were applied to the surgical FE models with different bone material properties. The operated L3-L4 segmental range of motion (ROM), the inserted cage's maximal caudal displacements, and L4 cranial bony endplate principal stress values were measured. RESULTS The nonaugmented values for the BPS construct were generally lower compared to SSA, and the difference was increased by osteoporosis. In osteoporotic bone, PMMA augmentation gradually decreased the investigated parameters and the difference between the two constructs as well. Between 3 cm3 and 4 cm3 of injected PMMA volume per screw, the difference between augmented SSA and standard BPS became comparable. CONCLUSIONS Based on this study, augmentation can enhance the primary stability of the constructs and decrease the difference between them. Considering leakage as a possible complication, between 3 cm3 and 4 cm3 of injected PMMA per screw can be an adequate amount for SSA augmentation. However, further in silico, and possibly in vitro and clinical testing is required to thoroughly understand the investigated biomechanical aspects. CLINICAL SIGNIFICANCE This study sheds light on the possible biomechanical advantage offered by augmented OLIF implants and provides a theoretical augmentation amount for the SSA construct. Based on the findings, the concept of an SSA device with PMMA augmentation capability is desirable.
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Affiliation(s)
- Ferenc Bereczki
- In Silico Biomechanics Laboratory, National Center for Spinal Disorders, Királyhágó Str. 1-3, Budapest, Hungary; School of PhD Studies, Semmelweis University, Üllői Str. 26, Budapest, Hungary
| | - Mate Turbucz
- In Silico Biomechanics Laboratory, National Center for Spinal Disorders, Királyhágó Str. 1-3, Budapest, Hungary; School of PhD Studies, Semmelweis University, Üllői Str. 26, Budapest, Hungary
| | - Agoston Jakab Pokorni
- In Silico Biomechanics Laboratory, National Center for Spinal Disorders, Királyhágó Str. 1-3, Budapest, Hungary; School of PhD Studies, Semmelweis University, Üllői Str. 26, Budapest, Hungary
| | - Benjamin Hajnal
- In Silico Biomechanics Laboratory, National Center for Spinal Disorders, Királyhágó Str. 1-3, Budapest, Hungary; School of PhD Studies, Semmelweis University, Üllői Str. 26, Budapest, Hungary
| | - Marton Ronai
- National Center for Spinal Disorders, Királyhágó Str. 1-3, Budapest, Hungary
| | - Istvan Klemencsics
- National Center for Spinal Disorders, Királyhágó Str. 1-3, Budapest, Hungary
| | - Aron Lazary
- In Silico Biomechanics Laboratory, National Center for Spinal Disorders, Királyhágó Str. 1-3, Budapest, Hungary; Department of Spine Surgery, Department of Orthopaedics, Semmelweis University, Üllői Str. 78/b, Budapest, Hungary
| | - Peter Endre Eltes
- In Silico Biomechanics Laboratory, National Center for Spinal Disorders, Királyhágó Str. 1-3, Budapest, Hungary; Department of Spine Surgery, Department of Orthopaedics, Semmelweis University, Üllői Str. 78/b, Budapest, Hungary.
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Jiang F, Li X, Liu L, Xie Z, Wu X, Wang Y. Automated machine learning-based model for the prediction of pedicle screw loosening after degenerative lumbar fusion surgery. Biosci Trends 2024; 18:83-93. [PMID: 38417874 DOI: 10.5582/bst.2023.01327] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/01/2024]
Abstract
The adequacy of screw anchorage is a critical factor in achieving successful spinal fusion. This study aimed to use machine learning algorithms to identify critical variables and predict pedicle screw loosening after degenerative lumbar fusion surgery. A total of 552 patients who underwent primary transpedicular lumbar fixation for lumbar degenerative disease were included. The LASSO method identified key features associated with pedicle screw loosening. Patient clinical characteristics, intraoperative variables, and radiographic parameters were collected and used to construct eight machine learning models, including a training set (80% of participants) and a test set (20% of participants). The XGBoost model exhibited the best performance, with an AUC of 0.884 (95% CI: 0.825-0.944) in the test set, along with the lowest Brier score. Ten crucial variables, including age, disease diagnosis: degenerative scoliosis, number of fused levels, fixation to S1, HU value, preoperative PT, preoperative PI-LL, postoperative LL, postoperative PT, and postoperative PI-LL were selected. In the prospective cohort, the XGBoost model demonstrated substantial performance with an accuracy of 83.32%. This study identified crucial variables associated with pedicle screw loosening after degenerative lumbar fusion surgery and successfully developed a machine learning model to predict pedicle screw loosening. The findings of this study may provide valuable information for clinical decision-making.
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Affiliation(s)
- Feng Jiang
- Southeast University Medical College, Nanjing, Jiangsu, China
| | - Xinxin Li
- Southeast University Medical College, Nanjing, Jiangsu, China
| | - Lei Liu
- Department of Spine Surgery, Southeast University ZhongDa Hospital, Nanjing, Jiangsu, China
| | - Zhiyang Xie
- Department of Spine Surgery, Southeast University ZhongDa Hospital, Nanjing, Jiangsu, China
| | - Xiaotao Wu
- Southeast University Medical College, Nanjing, Jiangsu, China
- Department of Spine Surgery, Southeast University ZhongDa Hospital, Nanjing, Jiangsu, China
| | - Yuntao Wang
- Southeast University Medical College, Nanjing, Jiangsu, China
- Department of Spine Surgery, Southeast University ZhongDa Hospital, Nanjing, Jiangsu, China
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Wang X, Zhao W, Chen X, Zhang P, Zhou Z, Yan X, Song Z, Lin S, Chen W, Shang Q, Chen H, Liang D, Shen G, Ren H, Jiang X. Correlation of Hounsfield Units with Bone Mineral Density and T-Score in Chinese Adults. World Neurosurg 2024; 183:e261-e267. [PMID: 38159603 DOI: 10.1016/j.wneu.2023.12.073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2023] [Revised: 12/11/2023] [Accepted: 12/12/2023] [Indexed: 01/03/2024]
Abstract
OBJECTIVE To examine the association between vertebral cancellous Hounsfield units (HUs), age, bone mineral density, and T-score in a sample of Chinese adults. METHODS The study included a sample of 739 participants. Age, bone mineral density, and T-score of each participant were recorded, and HUs were measured in the L1-L4 vertebrae. RESULTS Data analysis revealed that HUs of vertebral cancellous bone across the pedicle level decreased with age, with women having higher values than men up to age 50 and vice versa thereafter. Furthermore, a positive correlation was found between HUs of vertebral cancellous bone across the pedicle level and bone mineral density/T-score in the L1-L4 vertebrae, but with a weaker correlation in the L4 vertebrae. Additionally, HU values for participants with osteoporosis were significantly lower than HU values for participants with osteopenia and normal bone health. CONCLUSIONS From the findings of this study, it can be concluded that HUs may be a potential predictor of bone health, with implications for presurgical assessment of the quality of bone-screw interfaces for spinal surgery.
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Affiliation(s)
- Xiaowen Wang
- Panyu Hospital of Chinese Medicine, Guangzhou, China
| | - Wenhua Zhao
- Guangzhou Medical University Second Affiliated Hospital, Guangzhou, China
| | - Xingda Chen
- Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Peng Zhang
- Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Zelin Zhou
- Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Xianwei Yan
- Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Zefeng Song
- Department of Medical, Dalian University of Technology, Dalian, China
| | | | - Wanyan Chen
- Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Qi Shang
- Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Honglin Chen
- Guangzhou University of Chinese Medicine, Guangzhou, China
| | - De Liang
- Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Gengyang Shen
- Guangzhou Medical University Second Affiliated Hospital, Guangzhou, China
| | - Hui Ren
- Guangzhou Medical University Second Affiliated Hospital, Guangzhou, China
| | - Xiaobing Jiang
- Guangzhou Medical University Second Affiliated Hospital, Guangzhou, China.
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Khalaf K, Nikkhoo M, Shams S, Niu CC, Cheng CH. Impact of osteoporosis and Cement-Augmented fusion on adjacent spinal levels Post-Fusion Surgery: Patient-Specific finite element analysis. J Biomech 2024; 166:112070. [PMID: 38569456 DOI: 10.1016/j.jbiomech.2024.112070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2023] [Revised: 03/26/2024] [Accepted: 03/30/2024] [Indexed: 04/05/2024]
Abstract
Cement-augmentation is a technique commonly used during posterior lumbar instrumented fusion (PLIF) to reinforce compromised osteoporotic vertebral bone, minimize the risk of loosening screws, enhance stability, and improve overall surgical outcomes. In this study, we introduce a novel segmented vertebral body regional modeling approach to investigate the effects of osteoporosis and cement-augmented lumbar fusion on disc biomechanics at spinal levels adjacent to the fused vertebrae. Using our previously validated personalized-poroelastic-osteoligamentous FE model of the spine, fusion was simulated at L4-L5, and the biomechanics of adjacent levels were studied for 30 patients (non-osteoporotic patients (N = 15), osteoporotic patients (N = 15)). PLIF models, with and without cement-augmentation, were developed and compared after an 8 h-rest period (200 N), following a 16 h-cyclic compressive loading of 500-1000 N (40 and 20 min, respectively). Movement in different directions (flexion/ extension/ lateral bending/ axial rotation) was simulated using 10Nm moment before and after cyclic loading. The material mapping algorithm was validated by comparing the results of voxel-based and parametric models. The FE cement-augmented models, subject to daily activity loading, demonstrated significant differences in disc height loss and fluid loss as compared to non-cemented models. The calculated axial stress and fiber strain values were also significantly higher for these models. This work demonstrates that although osteoporosis does not significantly alter the time-dependent characteristics of adjacent IVDs post-surgery, cement-augmentation increases the risk of adjacent segment disease (ASD) incidence. A holistic understanding of the trade-offs and long-term complex interplay between structural reinforcement modalities, including cement augmentation, and altered biomechanics warrants further investigation.
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Affiliation(s)
- Kinda Khalaf
- College of Medicine and Health Sciences, Khalifa University of Science and Technology, and Health Engineering Innovation Center, Abu Dhabi, United Arab Emirates.
| | - Mohammad Nikkhoo
- School of Physical Therapy and Graduate Institute of Rehabilitation Science, College of Medicine, Chang Gung University, Taoyuan, Taiwan; Bone and Joint Research Center, Chang Gung Memorial Hospital, Linkou, Taiwan; Department of Biomedical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Shohreh Shams
- Department of Biomedical Engineering, Amirkabir University of Technology, Tehran, Iran
| | - Chi-Chien Niu
- Bone and Joint Research Center, Chang Gung Memorial Hospital, Linkou, Taiwan; Department of Orthopedic Surgery, Chang Gung Memorial Hospital, Linkou, Taiwan
| | - Chih-Hsiu Cheng
- School of Physical Therapy and Graduate Institute of Rehabilitation Science, College of Medicine, Chang Gung University, Taoyuan, Taiwan; Bone and Joint Research Center, Chang Gung Memorial Hospital, Linkou, Taiwan.
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Oberthür S, Roch PJ, Klockner F, Jäckle KB, Viezens L, Lehmann W, Sehmisch S, Weiser L. Can You Feel it? - Correlation Between Intraoperatively Perceived Bone Quality and Objectively Measured Bone Mineral Density. Global Spine J 2024; 14:631-638. [PMID: 35993490 PMCID: PMC10802517 DOI: 10.1177/21925682221120398] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
STUDY DESIGN clinical study. OBJECTIVES Loosening of pedicle screws is a frequent complication in patients with osteoporosis. The indication for additional stabilization, such as cement augmentation, is more often based on the subjective intraoperative feeling of the surgeon than on a preoperative bone mineral density (BMD) measurement. Aim was to evaluate the correlation of the intraoperative perceived bone quality in comparison to the objectively measured BMD. METHODS A total of 62 patients undergoing dorsal stabilization using pedicle screws at a level-1 trauma center were analyzed. The preoperative CT scan measured each instrumented vertebra's pedicle size and BMD. During the surgery, the perceived screw stability was graded by the respective surgeon for each screw. RESULTS 204 vertebral bodies were evaluated. Looking at all implanted screws a significant correlation between the measured BMD and the perceived screw stability was found (Resident r = .450; R2 = .202; P < .001/Attending r = .364; R2 = .133; P < .001), but there was no significant correlation in the osteoporotic patients (Resident P = .148 / Attending P = .907). The evaluation of the screws implanted in osteoporotic vertebrae showed that the surgeons considered a total of 31% of these screws to be sufficiently stable. CONCLUSIONS There was no significant correlation between the measured BMD and the perceived pedicle screw stability in the group with osteopenic / osteoporotic bone (<100 mg/cm³). The results indicate that it is not possible to reliably determine the bone quality and the resulting screw stability in patients with reduced BMD. The preoperative measurement of the BMD should become a crucial part of preoperative planning.
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Affiliation(s)
- Swantje Oberthür
- Department of Trauma Surgery, Orthopaedic Surgery and Plastic Surgery, University Medical Center Göttingen, Göttingen, Germany
- Department of Trauma Surgery, Medical School Hannover, Hannover, Germany
| | - Paul Jonathan Roch
- Department of Trauma Surgery, Orthopaedic Surgery and Plastic Surgery, University Medical Center Göttingen, Göttingen, Germany
| | - Friederike Klockner
- Department of Trauma Surgery, Orthopaedic Surgery and Plastic Surgery, University Medical Center Göttingen, Göttingen, Germany
| | - Katharina Blanka Jäckle
- Department of Trauma Surgery, Orthopaedic Surgery and Plastic Surgery, University Medical Center Göttingen, Göttingen, Germany
| | - Lennart Viezens
- Department of Trauma and Orthopaedic Surgery, Division of Spine Surgery, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Wolfgang Lehmann
- Department of Trauma Surgery, Orthopaedic Surgery and Plastic Surgery, University Medical Center Göttingen, Göttingen, Germany
| | - Stephan Sehmisch
- Department of Trauma Surgery, Orthopaedic Surgery and Plastic Surgery, University Medical Center Göttingen, Göttingen, Germany
- Department of Trauma Surgery, Medical School Hannover, Hannover, Germany
| | - Lukas Weiser
- Department of Trauma Surgery, Orthopaedic Surgery and Plastic Surgery, University Medical Center Göttingen, Göttingen, Germany
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van Tiel J, Tan T, Tee J, Marion T, Öner F, Rutges J. Outcome of traumatic thoracolumbar spine fractures in elderly: A systematic review. BRAIN & SPINE 2024; 4:102775. [PMID: 38510601 PMCID: PMC10951749 DOI: 10.1016/j.bas.2024.102775] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/30/2023] [Revised: 02/01/2024] [Accepted: 02/19/2024] [Indexed: 03/22/2024]
Abstract
Introduction Adequate guidelines for treatment of people over 65 years, suffering traumatic thoracolumbar spine fractures without neurologic deficit, are currently lacking. Research question The aim of this study was to systematically review the available literature regarding the outcome of conservative and surgical treatment of thoracolumbar spinal trauma in elderly patients. Material and methods A systematic review according the PRISMA guidelines was performed. Pubmed, Web of Science, EMBASE and the Cochrane Central register were searched until June 2021. Risk of bias of the included studies was evaluated. Clinical and radiological results, as well as complications of conservative or surgical treatment were reviewed. Results Six articles were included (one prospective randomized trial, two prospective and three retrospective cohort studies). In these studies conflicting results were observed with regard to pain, radiological results and complications following both conservative and surgical treatment strategies for thoracolumbar spine fractures in elderly. Discussion and conclusion Treatment of thoracolumbar fractures in elderly should focus on early mobilization to reduce complications and hospital stay. This may improve functional outcome and prevent worsening of frailty in this vulnerable group of patients. To elucidate the optimal treatment for elderly patient with thoracolumbar fractures, future research should focus on patient specific treatment rather than the mere difference between outcome of surgical and conservative treatment.
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Affiliation(s)
- J. van Tiel
- Department of Orthopedic Surgery, University Medical Center Utrecht, Utrecht, the Netherlands
| | - T. Tan
- Department of Neurosurgery, The Alfred Hospital, Melbourne, Victoria, Australia
- National Trauma Research Institute, Melbourne, Victoria, Australia
| | - J. Tee
- Department of Neurosurgery, The Alfred Hospital, Melbourne, Victoria, Australia
- National Trauma Research Institute, Melbourne, Victoria, Australia
| | - T.E. Marion
- Northern Ontario School of Medicine, Thunder Bay, ON, Canada
| | - F.C. Öner
- Department of Orthopedic Surgery, University Medical Center Utrecht, Utrecht, the Netherlands
| | - J.P.H.J. Rutges
- Department of Orthopedic Surgery, Erasmus Medical Center, University Medical Center Rotterdam, Rotterdam, the Netherlands
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Gao Y, Ye W, Ge X, Wang H, Xiong J, Zhu Y, Wang Z, Wang J, Tang P, Liu W, Cai W. Assessing the utility of MRI-based vertebral bone quality (VBQ) for predicting lumbar pedicle screw loosening. EUROPEAN SPINE JOURNAL : OFFICIAL PUBLICATION OF THE EUROPEAN SPINE SOCIETY, THE EUROPEAN SPINAL DEFORMITY SOCIETY, AND THE EUROPEAN SECTION OF THE CERVICAL SPINE RESEARCH SOCIETY 2024; 33:289-297. [PMID: 37981599 DOI: 10.1007/s00586-023-08034-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Revised: 10/18/2023] [Accepted: 10/28/2023] [Indexed: 11/21/2023]
Abstract
STUDY DESIGN Retrospective cohort. OBJECTIVE The purpose of this study is to assess the potential of utilizing the MRI-based vertebral bone quality (VBQ) score as a predictive tool for pedicle screw loosening (PSL) in patients who have undergone pedicle screw fixation and to identify risk factors associated with VBQ scores. METHODS One hundred and sixteen patients who had undergone pedicle screw fixation between December 2019 and January 2021 and had more than a year of follow-up were divided into two groups of PSL and non-PSL. The radiological and clinical parameters investigated were age, gender, body mass index, the VBQ score, length of fusion and the DXA T-score. RESULTS Of the 116 patients included in the study, 22 patients developed pedicle screw loosening after surgery (18.97%). VBQ score of PSL group was higher than the non-PSL group (3.61 ± 0.63 vs. 2. 86 ± 0.43, p < 0.001). According to logistic regression, PSL was independently linked with a higher VBQ score (OR = 3.555, 95% confidence interval [1.620-7.802], p < 0.005). The AUC of predicting screw loosening was 0.774 (p < 0.001) for VBQ score, and the best threshold was 3.055 (sensitivity, 81.8%; specificity, 71.3%). High VBQ score was associated with age (r (114) = 0.29, p = 0.002), while it was not negatively correlated with T-scores of each part. CONCLUSION VBQ score is an independent predictor of pedicle screw loosening, with higher scores indicating a greater risk. Our results showed that older patients and women had higher VBQ scores.
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Affiliation(s)
- Yu Gao
- Department of Orthopedics, First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, Jiangsu Province, China
| | - Wu Ye
- Department of Orthopedics, First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, Jiangsu Province, China
| | - Xuhui Ge
- Department of Orthopedics, First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, Jiangsu Province, China
| | - Haofan Wang
- Department of Orthopedics, First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, Jiangsu Province, China
| | - Junjun Xiong
- Department of Orthopedics, First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, Jiangsu Province, China
| | - Yufeng Zhu
- Department of Orthopedics, First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, Jiangsu Province, China
| | - Zhuanghui Wang
- Department of Orthopedics, First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, Jiangsu Province, China
| | - Jiaxing Wang
- Department of Orthopedics, First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, Jiangsu Province, China
| | - Pengyu Tang
- Department of Orthopedics, First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, Jiangsu Province, China
| | - Wei Liu
- Department of Orthopedics, Second Affiliated Hospital of Naval Medical University, Shanghai, 200003, China.
| | - Weihua Cai
- Department of Orthopedics, First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, 210029, Jiangsu Province, China.
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Hu X, Barber SM, Ji Y, Kou H, Cai W, Cheng M, Liu H, Huang W, Yan W. Implant failure and revision strategies after total spondylectomy for spinal tumors. J Bone Oncol 2023; 42:100497. [PMID: 37635708 PMCID: PMC10457450 DOI: 10.1016/j.jbo.2023.100497] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2023] [Revised: 08/05/2023] [Accepted: 08/09/2023] [Indexed: 08/29/2023] Open
Abstract
Background Although there have been several risk factors reported for implant failure (IF), little consensus exists. Potential applicable measures to protect patients from IF are relatively few. This study aimed to discover new risk factors for IF and explore potential protective measures from IF after total spondylectomy for spinal tumors. Methods A total of 145 patients undergoing total spondylectomy for thoracic and lumbar spinal tumors between 2010 and 2021 were included from three tertiary university hospitals. Patient demographic and surgical characteristics and follow-up outcomes were collected. Results During a mean follow-up of 53.77 months (range, 12 to 149 months), 22 of 145 patients (15.17%) developed IF. Patients undergoing thoracolumbar junctional region (T12/L1) resection were more likely to develop IF compared to those undergoing surgery at other vertebral levels (HR = 21.622, 95% CI = 3.567-131.084, P = 0.001). Patients undergoing titanium mesh cage reconstruction were more likely to develop IF compared to patients undergoing expandable titanium cage reconstruction (HR = 8.315, 95% CI = 1.482-46.645, P = 0.016). Patients with bone cement augmentation around the cage were less likely to develop IF compared to those not receiving bone cement augmentation (HR = 0.015, 95% CI = 0.002-0.107, P < 0.001). Of the 22 patients with IF, 14 (63.63%) accepted personalized revision surgery. Conclusion The use of an expandable cage and the use of bone cement augmentation around the anterior column support cage are protective measures against IF after total spondylectomy.
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Affiliation(s)
- Xianglin Hu
- Department of Musculoskeletal Oncology, Spinal Tumor Center, Fudan University Shanghai Cancer Center, Shanghai, China
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Sean M Barber
- Department of Neurosurgery, Houston Methodist Neurological Institute, Houston Methodist Hospital, Houston, USA
| | - Yingzheng Ji
- Department of Orthopedic Surgery, Naval Medical Center of PLA, Naval Medical University, Shanghai, China
| | - Hongwei Kou
- Department of Orthopedic Surgery, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Weiluo Cai
- Department of Musculoskeletal Oncology, Spinal Tumor Center, Fudan University Shanghai Cancer Center, Shanghai, China
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Mo Cheng
- Department of Musculoskeletal Oncology, Spinal Tumor Center, Fudan University Shanghai Cancer Center, Shanghai, China
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Hongjian Liu
- Department of Orthopedic Surgery, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Wending Huang
- Department of Musculoskeletal Oncology, Spinal Tumor Center, Fudan University Shanghai Cancer Center, Shanghai, China
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Wangjun Yan
- Department of Musculoskeletal Oncology, Spinal Tumor Center, Fudan University Shanghai Cancer Center, Shanghai, China
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China
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Wang Y, Yang L, Li C, Sun H. A Biomechanical Study on Cortical Bone Trajectory Screw Fixation Augmented With Cement in Osteoporotic Spines. Global Spine J 2023; 13:2115-2123. [PMID: 35042407 PMCID: PMC10538326 DOI: 10.1177/21925682211070826] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
STUDY DESIGN A biomechanical study. OBJECTIVE To evaluate the efficacy and feasibility of cement-augmented cortical bone trajectory (CBT) screw fixation. METHODS Forty-nine CBT screws were inserted into lumbar vertebrae guided by three-dimensionally printed templates, and then injected with 0, .5, or 1.0 mL of polymethylmethacrylate. The screw placement accuracy, cement dispersion, and cement leakage rate were evaluated radiologically. Biomechanical tests were performed to measure the axial pull-out strength and torque value. RESULTS Overall, 83.67% of the screws were inserted without pedicle perforation. In the 1.0 mL group, cement dispersed into the pedicle zone and formed a concentrated mass more often than in the .5 mL group, but not significantly more often (P > .05). The total cement leakage rate was 18.75%. Compared with the control group, the torque value was slightly higher in the .5 mL group (P = .735) and significantly higher in the 1.0 mL group (P = .026). However, there was no significant difference between the .5 and 1.0 mL groups (P = .431). The maximal pull-out force (Fmax) was increased by 52.85% and 72.73% in the .5 and 1.0 mL groups, respectively, compared with the control group (P < .05). However, the difference was not significant between the 2 cemented groups (P = .985). CONCLUSIONS Cement augmentation is a useful method for increasing CBT screw stability in osteoporotic spines. The cement injection volume is recommended to be 1 mL for each screw, and the cement should disperse into the vertebral body than the pedicle zones.
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Affiliation(s)
- Yuetian Wang
- Department of Orthopedics, Peking University First Hospital, Beijing, China
| | - Lei Yang
- Center for Health Science and Engineering (CHSE), School of Health Sciences and Biomedical Engineering, Hebei University of Technology, Tianjin, China
| | - Chunde Li
- Department of Orthopedics, Peking University First Hospital, Beijing, China
| | - Haolin Sun
- Department of Orthopedics, Peking University First Hospital, Beijing, China
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Song Z, Zhou Q, Jin X, Zhang J. Cement-augmented pedicle screw for thoracolumbar degenerative diseases with osteoporosis: a systematic review and meta-analysis. J Orthop Surg Res 2023; 18:631. [PMID: 37641101 PMCID: PMC10464480 DOI: 10.1186/s13018-023-04077-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Accepted: 08/04/2023] [Indexed: 08/31/2023] Open
Abstract
BACKGROUND Cement-augmentation pedicle screws have been widely used in spinal internal fixation surgery combined with osteoporosis in recent years, which can significantly improve the fixation strength, but compared with conventional methods, whether it has more advantages is still inconclusive of evidencebased medicine. To systematically evaluate the efficacy and safety of cement-augmented pedicle screw in the treatment of thoracolumbar degenerative diseases with osteoporosis. METHODS We searched PubMed, Embase, and Cochrane Library for studies published from the establishment of the database up until June 2023. We included studies that concerning the cement-augmented pedicle screw and the traditional pedicle screw placement for thoracolumbar degenerative diseases with osteoporosis. We excluded repeated publication, researches without full text, incomplete information or inability to conduct data extraction and animal experiments, case report, reviews and systematic reviews. STATA 15.1 software was used to analyze the data. RESULTS A total of 12 studies were included in this meta-analysis. The sample size of patients were totally 881, of which, 492 patients in cement-augmented screw group and 389 patients in conventional screw group. Meta-analysis results showed that Japanese Orthopaedic Association (JOA) score (WMD = 1.69, 95% CI 1.15 to 2.22), intervertebral space height (WMD = 1.66, 95% CI 1.03 to 2.29) and post-operation fusion rate (OR = 2.80, 95% CI 1.49 to 5.25) were higher in the cement-augmented screw group than those in the conventional screw group. Operation time was longer in the cement-augmented screw group than that in the conventional screw group (WMD = 15.47, 95% CI 1.25 to 29.70). Screw loosening rate was lower in the cement-augmented screw group than those in the conventional screw group (OR = 0.13, 95% CI 0.07 to 0.22). However, hospitalization time, intraoperative blood loss and Visual analog scale (VAS) score were not significantly different between the two groups (P > 0.05). CONCLUSION Compared with conventional pedicle screw placement, cement-augmented pedicle screw is more effective in the treatment of osteoporotic thoracolumbar degenerative disease by improving fusion rate and interbody height, reducing the incidence of screw loosening, and elevating long-term efficacy.
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Affiliation(s)
- Zhoufeng Song
- The First Affiliated Hospital of Zhejiang Chinese Medical University (Zhejiang Provincial Hospital of Chinese Medicine), 54 Post and Telegraph Road Uptown, Hangzhou, 310000, China
| | - Qiujun Zhou
- Department of First Clinical Medical College, Zhejiang Chinese Medical University, Hangzhou, 310000, China
| | - Xiaoliang Jin
- Department of First Clinical Medical College, Zhejiang Chinese Medical University, Hangzhou, 310000, China
| | - Jinjie Zhang
- The First Affiliated Hospital of Zhejiang Chinese Medical University (Zhejiang Provincial Hospital of Chinese Medicine), 54 Post and Telegraph Road Uptown, Hangzhou, 310000, China.
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Zhao H, Wang YJ, Wang RG, Liu D, Duan YQ, Liu YJ, Zeng YH, Zhao QP, Zhang ZP. Three-Dimensional Hounsfield Units Measurement of Pedicle Screw Trajectory for Predicating Screw Loosening in Lumbar Fusion Surgery. Clin Interv Aging 2023; 18:485-493. [PMID: 37008803 PMCID: PMC10065021 DOI: 10.2147/cia.s389059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2022] [Accepted: 03/22/2023] [Indexed: 03/29/2023] Open
Abstract
Purpose Dual-energy X-ray absorptiometry (DXA) is commonly used for evaluation of bone mineral density before spinal surgery, but frequently leads to overestimation in degenerative spinal diseases due to osteoproliferation factors. We introduce a novel method to compare the predictive ability of Hounsfield Units (HU) and DXA methods to predict screw loosening after lumbar interbody fusion surgery in degenerative spinal diseases by measuring HU of pedicle screw trajectory on computed tomography (CT) images preoperatively. Patients and Methods This retrospective study was conducted on patients who underwent posterior lumbar fusion surgery for degenerative diseases. CT HUs measurement was performed using medical imaging software, including the cancellous region on cross-sections of the vertebral body and three-dimensional pedicle screw trajectory. Receiver operating characteristic (ROC) curve analyses were performed for the risk of pedicle screw loosening in association with the Hounsfield scale and preoperative BMD, and the area under the curve (AUC) and the cutoff values were calculated. Results A total of 90 patients were enrolled and were divided into loosening (n = 33, 36.7%) and non-loosening groups (n = 57, 63.3%). No significant differences in age, gender, length of fixation and preoperative BMD were found between both groups. The loosening group showed lower CT HU values in the vertebral body and screw trajectory than the non-loosening group. Screw trajectory HU (ST-HU) exhibited a higher AUC value than vertebral body HU (B-HU). The cutoff values of B-HU and ST-HU were 160 and 110 HUs, respectively. Conclusion Three-dimensional pedicle screw trajectory HU values yields a stronger predictive value than vertebral body HU values and BMD and may provide more guidance for surgery. The risk of screw loosening is significantly increased at ST-HU <110 or B-HU <160 at L5 segment.
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Affiliation(s)
- He Zhao
- Department of Emergency Medicine, Honghui Hospital, Xi’an Jiaotong University, Xi’an, Shaanxi, 710054, People’s Republic of China
| | - Yan-jun Wang
- Department of Emergency Medicine, Honghui Hospital, Xi’an Jiaotong University, Xi’an, Shaanxi, 710054, People’s Republic of China
| | - Rui-guo Wang
- Department of Spine Surgery, Honghui Hospital, Xi’an Jiaotong University, Xi’an, Shaanxi, 710054, People’s Republic of China
| | - Da Liu
- Department of Orthopaedics, General Hospital of Western Theatre Command of PLA, Chengdu, Sichuan, 610083, People’s Republic of China
| | - Ya-qing Duan
- Department of Imaging, Honghui Hospital, Xi’an Jiaotong University, Xi’an, Shaanxi, 710054, People’s Republic of China
| | - Yang-jin Liu
- Department of Emergency Medicine, Honghui Hospital, Xi’an Jiaotong University, Xi’an, Shaanxi, 710054, People’s Republic of China
| | - Yu-hong Zeng
- Department of Osteoporosis, Honghui Hospital, Xi’an Jiaotong University, Xi’an, Shaanxi, 710054, People’s Republic of China
| | - Qin-peng Zhao
- Department of Spine Surgery, Honghui Hospital, Xi’an Jiaotong University, Xi’an, Shaanxi, 710054, People’s Republic of China
| | - Zheng-ping Zhang
- Department of Spine Surgery, Honghui Hospital, Xi’an Jiaotong University, Xi’an, Shaanxi, 710054, People’s Republic of China
- Correspondence: Zheng-ping Zhang, Department of Spine Surgery, Honghui Hospital, Xi’an Jiaotong University, No. 76 Nanguo Road, Xi’an, Shaanxi, 710054, People’s Republic of China, Tel +86 17791674069, Email
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Tian X, Raina DB, Vater C, Kilian D, Ahlfeld T, Platzek I, Nimtschke U, Tägil M, Lidgren L, Thomas A, Platz U, Schaser KD, Disch AC, Zwingenberger S. Evaluation of an Injectable Biphasic Calcium Sulfate/Hydroxyapatite Cement for the Augmentation of Fenestrated Pedicle Screws in Osteoporotic Vertebrae: A Biomechanical Cadaver Study. J Funct Biomater 2022; 13:jfb13040269. [PMID: 36547529 PMCID: PMC9786089 DOI: 10.3390/jfb13040269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2022] [Revised: 11/17/2022] [Accepted: 11/23/2022] [Indexed: 12/05/2022] Open
Abstract
Cement augmentation of pedicle screws is one of the most promising approaches to enhance the anchoring of screws in the osteoporotic spine. To date, there is no ideal cement for pedicle screw augmentation. The purpose of this study was to investigate whether an injectable, bioactive, and degradable calcium sulfate/hydroxyapatite (CaS/HA) cement could increase the maximum pull-out force of pedicle screws in osteoporotic vertebrae. Herein, 17 osteoporotic thoracic and lumbar vertebrae were obtained from a single fresh-frozen human cadaver and instrumented with fenestrated pedicle screws. The right screw in each vertebra was augmented with CaS/HA cement and the un-augmented left side served as a paired control. The cement distribution, interdigitation ability, and cement leakage were evaluated using radiographs. Furthermore, pull-out testing was used to evaluate the immediate mechanical effect of CaS/HA augmentation on the pedicle screws. The CaS/HA cement presented good distribution and interdigitation ability without leakage into the spinal canal. Augmentation significantly enhanced the maximum pull-out force of the pedicle screw in which the augmented side was 39.0% higher than the pedicle-screw-alone side. Therefore, the novel biodegradable biphasic CaS/HA cement could be a promising material for pedicle screw augmentation in the osteoporotic spine.
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Affiliation(s)
- Xinggui Tian
- University Center of Orthopaedic, Trauma and Plastic Surgery, University Hospital Carl Gustav Carus at Technische Universität Dresden, 01307 Dresden, Germany
- Center for Translational Bone, Joint and Soft Tissue Research, Faculty of Medicine, University Hospital Carl Gustav Carus at Technische Universität Dresden, 01307 Dresden, Germany
| | - Deepak B. Raina
- Department of Clinical Sciences Lund, Faculty of Medicine, Lund University, 22184 Lund, Sweden
| | - Corina Vater
- University Center of Orthopaedic, Trauma and Plastic Surgery, University Hospital Carl Gustav Carus at Technische Universität Dresden, 01307 Dresden, Germany
- Center for Translational Bone, Joint and Soft Tissue Research, Faculty of Medicine, University Hospital Carl Gustav Carus at Technische Universität Dresden, 01307 Dresden, Germany
| | - David Kilian
- Center for Translational Bone, Joint and Soft Tissue Research, Faculty of Medicine, University Hospital Carl Gustav Carus at Technische Universität Dresden, 01307 Dresden, Germany
| | - Tilman Ahlfeld
- Center for Translational Bone, Joint and Soft Tissue Research, Faculty of Medicine, University Hospital Carl Gustav Carus at Technische Universität Dresden, 01307 Dresden, Germany
| | - Ivan Platzek
- Department of Radiology, University Hospital Carl Gustav Carus at Technische Universität Dresden, 01307 Dresden, Germany
| | - Ute Nimtschke
- Institute of Anatomy, University Hospital Carl Gustav Carus at Technische Universität Dresden, 01307 Dresden, Germany
| | - Magnus Tägil
- Department of Clinical Sciences Lund, Faculty of Medicine, Lund University, 22184 Lund, Sweden
| | - Lars Lidgren
- Department of Clinical Sciences Lund, Faculty of Medicine, Lund University, 22184 Lund, Sweden
| | - Alexander Thomas
- University Center of Orthopaedic, Trauma and Plastic Surgery, University Hospital Carl Gustav Carus at Technische Universität Dresden, 01307 Dresden, Germany
| | - Uwe Platz
- University Center of Orthopaedic, Trauma and Plastic Surgery, University Hospital Carl Gustav Carus at Technische Universität Dresden, 01307 Dresden, Germany
| | - Klaus-Dieter Schaser
- University Center of Orthopaedic, Trauma and Plastic Surgery, University Hospital Carl Gustav Carus at Technische Universität Dresden, 01307 Dresden, Germany
| | - Alexander C. Disch
- University Center of Orthopaedic, Trauma and Plastic Surgery, University Hospital Carl Gustav Carus at Technische Universität Dresden, 01307 Dresden, Germany
| | - Stefan Zwingenberger
- University Center of Orthopaedic, Trauma and Plastic Surgery, University Hospital Carl Gustav Carus at Technische Universität Dresden, 01307 Dresden, Germany
- Center for Translational Bone, Joint and Soft Tissue Research, Faculty of Medicine, University Hospital Carl Gustav Carus at Technische Universität Dresden, 01307 Dresden, Germany
- Correspondence:
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13
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Wang SK, Wang P, Li XY, Kong C, Niu JY, Lu SB. Incidence and risk factors for early and late reoperation following lumbar fusion surgery. J Orthop Surg Res 2022; 17:385. [PMID: 35962390 PMCID: PMC9373505 DOI: 10.1186/s13018-022-03273-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Accepted: 07/25/2022] [Indexed: 11/10/2022] Open
Abstract
STUDY DESIGN Retrospective cohort study. PURPOSE The aim of our study was to determine the rates and indications of reoperations following primary lumbar fusion, as well as the independent risk factors for early and late reoperation. METHODS We retrospectively reviewed patients who underwent lumbar fusion surgery between January 2017 and March 2020. All patients were followed up for more than 2 years. Characteristics, laboratory tests, primary diagnosis and surgery-related variables were compared among the early reoperation (< 3 months), the late reoperation (> 3 months) and the non-reoperation groups. Multivariable logistic regression analysis was used to identify independent risk factors for early and late reoperations. RESULTS Of 821 patients included in our studies, 34 patients underwent early reoperation, and 36 patients underwent late reoperation. The cumulative reoperation rate was about 4.1% (95% CI 3.8-4.5%) at 3 months, 6.2% (95% CI 5.9-6.5%) at 1 year and 8.2% (95% CI 8.0-8.5%) at 3 years. Multivariable analysis indicated that osteoporosis (odds ratio [OR] 3.6, 95% CI 1.2-10.5, p = 0.02) and diabetes (OR 2.1, 95% CI 1.1-4.5, p = 0.04) were independently associated with early reoperation and multilevel fusion (OR 2.4, 95% CI 1.1-5.4, p = 0.03) was independently associated with late reoperation. CONCLUSIONS The most common reasons for early reoperation and late operation were surgical site infection and adjacent segment diseases, respectively. Osteoporosis and diabetes were independent risk factors for early reoperation, and multilevel fusion was independent risk factor for late reoperation. Surgeons should pay more attention to these patients, and future studies should consider the effects of follow-up periods on results.
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Affiliation(s)
- Shuai-Kang Wang
- Department of Orthopedics, Xuanwu Hospital, Capital Medical University, No. 45 Changchun Street, Xicheng District, Beijing, 10053, China.,National Clinical Research Center for Geriatric Diseases, Beijing, 10053, China
| | - Peng Wang
- Department of Orthopedics, Xuanwu Hospital, Capital Medical University, No. 45 Changchun Street, Xicheng District, Beijing, 10053, China.,National Clinical Research Center for Geriatric Diseases, Beijing, 10053, China
| | - Xiang-Yu Li
- Department of Orthopedics, Xuanwu Hospital, Capital Medical University, No. 45 Changchun Street, Xicheng District, Beijing, 10053, China.,National Clinical Research Center for Geriatric Diseases, Beijing, 10053, China
| | - Chao Kong
- Department of Orthopedics, Xuanwu Hospital, Capital Medical University, No. 45 Changchun Street, Xicheng District, Beijing, 10053, China.,National Clinical Research Center for Geriatric Diseases, Beijing, 10053, China
| | - Jia-Yin Niu
- Capital Med Univ, Ctr Heart, Beijing Chaoyang Hosp, Beijing, 100020, China
| | - Shi-Bao Lu
- Department of Orthopedics, Xuanwu Hospital, Capital Medical University, No. 45 Changchun Street, Xicheng District, Beijing, 10053, China. .,National Clinical Research Center for Geriatric Diseases, Beijing, 10053, China.
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Predicting pullout strength of pedicle screws in broken bones from X-ray images. J Mech Behav Biomed Mater 2022; 134:105366. [PMID: 35870229 DOI: 10.1016/j.jmbbm.2022.105366] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2022] [Revised: 06/23/2022] [Accepted: 07/09/2022] [Indexed: 12/19/2022]
Abstract
Pedicle screw fixation is one of the most common procedures used in spinal fusion surgery. The screw loosening is a major concern, which may be caused by broken pedicles. In vitro pullout tests or insertion torque are the main approaches for assessing the stability of the screw; however, direct evidence was lacking for clinical human spines. Here, we aim to provide a model that can predict the pullout strengths of pedicle screws in various pedicle conditions from X-ray images. A weighted embedded bone volume (EBV) model is proposed for pullout strengths prediction by considering the bone heterogeneity and confinement of the screw. We showed that the pullout strength is proportional to the EBV for homogeneous bone and the weighted EBV for layered composite bone. The proposed weighted EBV model is validated with in vitro Sawbones® pullout experiments. The results show that the model has better accuracy than the simple EBV model, with a coefficient of determination of 0.94. The proposed weighted EBV model can help assess the stability of a pedicle screw in a broken pedicle by simply examining 2D X-ray images.
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15
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Xu X, Cao Y, Fan J, Lv Y, Zhou F, Tian Y, Ji H, Zhang Z, Guo Y, Yang Z, Hou G. Is It Necessary to Remove the Implants After Fixation of Thoracolumbar and Lumbar Burst Fractures Without Fusion? A Retrospective Cohort Study of Elderly Patients. Front Surg 2022; 9:921678. [PMID: 35860196 PMCID: PMC9289234 DOI: 10.3389/fsurg.2022.921678] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2022] [Accepted: 06/20/2022] [Indexed: 11/25/2022] Open
Abstract
Objective Fractures of the thoracolumbar spine are the most common fractures of the spinal column. This retrospective cohort study aimed to determine whether it is necessary to remove implants of patients aged over 65 years after the fixation of thoracolumbar and lumbar burst fractures without fusion. Methods This retrospective cohort study included 107 consecutive patients aged ≥65 years without neurological deficits, who underwent non-fusion short posterior segmental fixation for thoracolumbar or lumbar burst fractures. Outcome measures included the visual analog score (VAS), Oswestry Disability Index (ODI), residual symptoms, complications, and imaging parameters. Patients were divided into groups A (underwent implant removal) and B (implant retention) and were examined clinically at 1, 3, 6, and 12 months postoperatively and annually thereafter, with a final follow-up at 48.5 months. Results Overall, 96 patients with a mean age of 69.4 (range, 65–77) years were analyzed. At the latest follow-up, no significant differences were observed in functional outcomes and radiological parameters between both groups, except in the local motion range (LMR) (P = 0.006). Similarly, between preimplant removal and the latest follow-up in group A, significant differences were found only in LMR (P < 0.001). Two patients experienced screw breakage without clinical symptoms. Significant differences were only found in operation time, blood loss, ODI, and fracture type between minimally invasive group and open group. Conclusions Similar radiological and functional outcomes were observed in elderly patients, regardless of implant removal. Implant removal may not be necessary after weighing the risks and benefits for elderly patients. Patients should be informed about the possibility of implant breakage and accelerating degeneration of adjacent segments in advance.
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Affiliation(s)
- Xiangyu Xu
- Department of Orthopedics, Peking University Third Hospital, Beijing, China
- Engineering Research Center of Bone and Joint Precision Medicine, Ministry of Education, Beijing, China
| | - Yuan Cao
- Department of Orthopedics, Peking University Third Hospital, Beijing, China
- Engineering Research Center of Bone and Joint Precision Medicine, Ministry of Education, Beijing, China
| | - JiXing Fan
- Department of Orthopedics, Peking University Third Hospital, Beijing, China
- Engineering Research Center of Bone and Joint Precision Medicine, Ministry of Education, Beijing, China
| | - Yang Lv
- Department of Orthopedics, Peking University Third Hospital, Beijing, China
- Engineering Research Center of Bone and Joint Precision Medicine, Ministry of Education, Beijing, China
- Correspondence: Fang Zhou ; Yang Lv
| | - Fang Zhou
- Department of Orthopedics, Peking University Third Hospital, Beijing, China
- Engineering Research Center of Bone and Joint Precision Medicine, Ministry of Education, Beijing, China
- Correspondence: Fang Zhou ; Yang Lv
| | - Yun Tian
- Department of Orthopedics, Peking University Third Hospital, Beijing, China
- Engineering Research Center of Bone and Joint Precision Medicine, Ministry of Education, Beijing, China
| | - Hongquan Ji
- Department of Orthopedics, Peking University Third Hospital, Beijing, China
- Engineering Research Center of Bone and Joint Precision Medicine, Ministry of Education, Beijing, China
| | - Zhishan Zhang
- Department of Orthopedics, Peking University Third Hospital, Beijing, China
- Engineering Research Center of Bone and Joint Precision Medicine, Ministry of Education, Beijing, China
| | - Yan Guo
- Department of Orthopedics, Peking University Third Hospital, Beijing, China
- Engineering Research Center of Bone and Joint Precision Medicine, Ministry of Education, Beijing, China
| | - Zhongwei Yang
- Department of Orthopedics, Peking University Third Hospital, Beijing, China
- Engineering Research Center of Bone and Joint Precision Medicine, Ministry of Education, Beijing, China
| | - Guojin Hou
- Department of Orthopedics, Peking University Third Hospital, Beijing, China
- Engineering Research Center of Bone and Joint Precision Medicine, Ministry of Education, Beijing, China
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Toro G, Braile A, De Cicco A, Pezzella R, Ascione F, Cecere AB, Schiavone Panni A. Fragility Fractures of the Acetabulum: Current Concepts for Improving Patients' Outcomes. Indian J Orthop 2022; 56:1139-1149. [PMID: 35813545 PMCID: PMC9232661 DOI: 10.1007/s43465-022-00653-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/18/2021] [Accepted: 05/04/2022] [Indexed: 02/04/2023]
Abstract
The incidence of fragility fractures of the acetabulum (FFA) is constantly increasing. Generally, these fractures are related to a fall on the greater trochanter involving the anterior column. The management of FFA is extremely difficult considering both patients' comorbidities and poor bone quality. Both non-operative and several operative treatment protocols are available, and the choice among them is still ambiguous. The proposed surgical techniques for FFA [namely open reduction and internal fixation (ORIF), percutaneous fixation and total hip arthroplasty (THA)] are associated with a high complication rate. The treatment with the higher early mortality is the ORIF + THA, while the one with the lowest is the non-operative. However, at longer follow-up, this difference dreadfully change is becoming the opposite. Frequently ORIF, percutaneous fixation, and non-operative treatment need a subsequent re-operation through a THA. This latter could be extremely difficult, because of poor bone quality, acetabular mal union/non-union, bone gaps and hardware retention. However, the outcomes of each of the proposed treatment are mostly poor and controverted; therefore, a comprehensive patient evaluation and an accurate fracture description are required to appropriately manage acetabular fracture in the elderly.
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Affiliation(s)
- Giuseppe Toro
- grid.9841.40000 0001 2200 8888Department of Medical and Surgical Specialties and Dentistry, University of Campania “Luigi Vanvitelli”, 80138 Naples, Italy ,grid.6530.00000 0001 2300 0941Department of Clinical Sciences and Translational Medicine, University of Rome Tor Vergata, 00133 Rome, Italy
| | - Adriano Braile
- grid.9841.40000 0001 2200 8888Department of Medical and Surgical Specialties and Dentistry, University of Campania “Luigi Vanvitelli”, 80138 Naples, Italy
| | - Annalisa De Cicco
- grid.9841.40000 0001 2200 8888Department of Medical and Surgical Specialties and Dentistry, University of Campania “Luigi Vanvitelli”, 80138 Naples, Italy
| | - Raffaele Pezzella
- Unit of Orthopedics and Traumatology, AORN San Giuseppe Moscati, 83100 Avellino, Italy
| | - Francesco Ascione
- grid.461850.eDepartment of Orthopaedic and Traumatology Surgery, Ospedale Buon Consiglio Fatebenefratelli, 80123 Naples, Italy
| | - Antonio Benedetto Cecere
- grid.9841.40000 0001 2200 8888Department of Medical and Surgical Specialties and Dentistry, University of Campania “Luigi Vanvitelli”, 80138 Naples, Italy
| | - Alfredo Schiavone Panni
- grid.9841.40000 0001 2200 8888Department of Medical and Surgical Specialties and Dentistry, University of Campania “Luigi Vanvitelli”, 80138 Naples, Italy
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Prediction of Sacral Screw Loosening after Lumbosacral Surgeries Involving Rigid Fixation of Sacral Bone Using Preoperative Computed Tomography Scans. BIOMED RESEARCH INTERNATIONAL 2022; 2022:7123139. [PMID: 35655477 PMCID: PMC9152424 DOI: 10.1155/2022/7123139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Revised: 04/04/2022] [Accepted: 04/30/2022] [Indexed: 11/21/2022]
Abstract
Objective To find a preoperative computed tomography-based method to predict the incidence of sacral screw loosening and assist surgical planning. Methods Surgically treated patients for degenerative lumbosacral disorders with rigid pedicle screw fixation of patients with L5-S1 vertebra in our center from January 2016 to January 2021 were retrospectively included in the current study. CT scan attenuation of the horizontal plane of the sacrum was measured with Hounsfield units (HU). Postoperative X-ray tests were used to diagnose screw loosening. The data was analyzed by independent sample t-tests, X2 analysis, Pearson correlation analysis, and ROC curve analysis. Results A total of 162 (114 male, 48 female, average age 63.7 ± 7.3 years) patients were included in the final analysis. Significant differences were found between the screw loosening group and nonloosening group concerning the HU value of the sacrum at the horizontal plane (P < 0.01). In ROC curve analysis, AUC was 0.674 (95% CI: 0.592-0.756). A cutoff of 200 HU provided 64.8% sensitivity and 62.4% specificity, and a cutoff of 150 HU provided 90.2% sensitivity. Conclusions Analyzing 162 patients with at least 12 months of follow-up, we propose cutoff CT attenuation values of 200 HU and 150 HU to take moderate and radical measures of screw augmentation to prevent screw loosening in the sacral bone.
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The Usefulness of Trabecular CT Attenuation Measurement at L4 Level to Predict Screw Loosening After Degenerative Lumbar Fusion Surgery: Consider Number of Fused Levels and Postoperative Sagittal Balance. Spine (Phila Pa 1976) 2022; 47:745-753. [PMID: 35102120 DOI: 10.1097/brs.0000000000004330] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
STUDY DESIGN Retrospective study. OBJECTIVE To evaluate the absolute value of L4 trabecular region-of-interest (t-ROI) computed tomography (CT) attenuation, which can predict pedicle screw loosening, and determine the changes in value according to number of fused levels and sagittal balance in patients undergoing lumbar fusion surgery. SUMMARY OF BACKGROUND DATA Although osteoporosis was not diagnosed in spinal dual x-ray absorptiometry preoperatively, we encountered several cases of screw loosening within 1 year of lumbar fusion surgery. METHODS We enrolled 478 patients and analyzed factors related to screw loosening. We evaluated the association between L4 t-ROI CT attenuation and screw loosening and determined the best cutoff value of t L4 t-ROI CT attenuation for predicting screw loosening. RESULTS The number of fused levels, postoperative C7-S1 sagittal vertical axis (SVA), and L4 t-ROI CT attenuation were independently correlated with screw loosening. According to number of fused level and postoperative C7-T1 SVA (≥36.9 mm or <36.9 mm), in patients with one-level fusion and C7-S1 SVA less than 36.9 mm, the optimal cutoff point of the L4 t-ROI CT attenuation predicting screw loosening was 106.5 Hounsfield unit (HU). L4 t-ROI attenuation did not change until two-level fusions. In patients with three-level fusions and C7-S1 SVA less than 36.9 mm, the optimal cutoff point of the L4 t-ROI CT attenuation predicting screw loosening was 159.0 HU. The optimal cutoff point of L4 t-ROI CT attenuation in patients with three-level fusions and C7-S1 SVA more than or equal to 36.9 mm was 191.0 HU. CONCLUSION L4 t-ROI CT attenuation value considering number of fused levels and sagittal balance is an accurate measurement method to predict screw loosening. Spine surgeons should be aware of the L4 t-ROI attenuation before surgery to improve the fusion rate and reduce instrument-related complications of lumbar spine surgery in osteoporotic patients. LEVEL OF EVIDENCE 3.
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Fu S, Zhang Y, Ai F, Wang J, Wu Z, Ma X, Wu Z, Wang Z, Lei W, Xia H. A novel bone cement injector augments Chinese osteoporotic lumbar pedicle screw channel: a biomechanical investigation. BMC Musculoskelet Disord 2022; 23:353. [PMID: 35413830 PMCID: PMC9004128 DOI: 10.1186/s12891-022-05181-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/31/2021] [Accepted: 02/25/2022] [Indexed: 11/10/2022] Open
Abstract
Background The study aimed to (1) create a series of pedicle injectors with different number of holes on the sheath especially for the Chinese elderly patients and (2) further investigate the effects of the injectors on the augmentation of pedicle screw among osteoporotic lumbar pedicle channel. Methods This study used the biomechanical test module of polyurethane (Pacific Research Laboratory Corp, USA) to simulate the mechanical properties of human osteoporotic cancellous bone. The bone cement injectors were invented based on anatomical parameters of lumbar pedicle in Chinese elderly patients. Mechanical test experiments were performed on the bone cement injectors according to the three groups, namely, a local augmentation group, a full-length augmentation group, and a control group. The local augmentation group included three subgroups including 4-hole group, 6-hole group, and 8-hole group. All holes were laterally placed. The full-length augmentation group was a straight-hole injector. The control group was defined that pedicle screws were inserted without any cement augmentation. Six screws were inserted in each group and the maximum insertion torque was recorded. After 24 h of injecting acrylic bone cement, routine X-ray and CT examinations were performed to evaluate the distribution of bone cement. The axial pull-out force of screws was tested with the help of the material testing system 858 (MTS-858) mechanical tester. Results The bone cement injectors were consisted of the sheaths and the steel rods and the sheaths had different number of lateral holes. The control group had the lowest maximum insertion torque as compared with the 4-hole, 6-hole, 8-hole, and straight pore groups (P < 0.01), but the differences between the 4-hole, 6-hole, 8-hole, and straight pore groups were no statistical significance. The control group had the lowest maximum axial pull-out force as compared with the other four groups (P < 0.01). Subgroup analysis showed the 8-hole group (161.35 ± 27.17 N) had the lower maximum axial pull-out force as compared with the 4-hole group (217.29 ± 49.68 N), 6-hole group (228.39 ± 57.83 N), and straight pore group (237.55 ± 35.96 N) (P < 0.01). Bone cement was mainly distributed in 1/3 of the distal end of the screw among the 4-hole group, in the middle 1/3 and distal end of the screw among the 6-hole group, in the proximal 1/3 of the screw among the 8-hole group, and along the long axis of the whole screw body in the straight pore group. It might indicate that the 8-hole and straight-hole groups were more vulnerable to spinal canal cement leakage. After pullout, bone cement was also closely connected with the screw without any looseness or fragmentation. Conclusions The bone cement injectors with different number of holes can be used to augment the pedicle screw channel. The pedicle screw augmented by the 4-hole or 6-hole sheath may have similar effects to the straight pore injector. However, the 8-hole injector may result in relatively lower pull-out strength and the straight pore injector has the risks of cement leakage as well as cement solidarization near the screw head.
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Affiliation(s)
- Suochao Fu
- Department of Orthopedics, General Hospital of Southern Theater Command of PLA, Guangzhou, 510000, People's Republic of China.
| | - Yu Zhang
- Department of Orthopedics, General Hospital of Southern Theater Command of PLA, Guangzhou, 510000, People's Republic of China
| | - Fuzhi Ai
- Department of Orthopedics, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, 510020, People's Republic of China
| | - Jianhua Wang
- Department of Orthopedics, General Hospital of Southern Theater Command of PLA, Guangzhou, 510000, People's Republic of China
| | - Zenghui Wu
- Department of Spine Surgery, the Third Affiliated Hospital of Guangzhou Medical University, Guangzhou, 510000, People's Republic of China
| | - Xiangyang Ma
- Department of Orthopedics, General Hospital of Southern Theater Command of PLA, Guangzhou, 510000, People's Republic of China
| | - Zixiang Wu
- Department of Orthopedics, General Hospital of Southern Theater Command of PLA, Guangzhou, 510000, People's Republic of China
| | - Zheng Wang
- Department of Orthopedics, the Fourth Medical Center of Chinese PLA General Hospital, Beijing, 100048, People's Republic of China
| | - Wei Lei
- Fourth Department of Orthopedics, Xijing Hospital, Air Force Military Medical University, Xi'an, 733399, People's Republic of China
| | - Hong Xia
- Department of Orthopedics, General Hospital of Southern Theater Command of PLA, Guangzhou, 510000, People's Republic of China
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Yaman O, Zileli M, Sharif S. Decompression and fusion surgery for osteoporotic vertebral fractures: WFNS Spine Committee Recommendations. J Neurosurg Sci 2022; 66:327-334. [PMID: 35380203 DOI: 10.23736/s0390-5616.22.05640-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
INTODUCTION Osteoporotic vertebral fractures (OVF) are common due to aging populations. Their clinical management remains controversial. Although conservative approaches are sufficient in most cases, there are certain conditions where decompression or fusion surgery are necessary. This manuscript aims to clarify the indications and types of surgeries for OVF. EVIDENCE ACQUISITION A Medline and Pubmed search spanning the period between 2010 and 2020 was performed using the keywords "osteoporotic vertebral fractures and decompression surgery" and "osteoporotic vertebral fractures and fusion surgery". In addition, we reviewed up-to-date information on decompression and fusion in osteoporotic vertebral fracture (OVF) to reach an agreement in two consensus meetings of the World Federation of Neurosurgical Societies (WFNS) Spine Committee that was held in January and February 2021. The Delphi method was utilized to improve the validity of the questionnaire. EVIDENCE SYNTHESIS A total of 19 studies examining decompression and fusion surgery in OVF were reviewed. Literature supports the statement that decompression and fusion surgery are necessary for progressive neurological deficits after OVF. The Spine Section of the German Society for Orthopedics and Trauma (DGOU) classification revealed that it might help make surgical decisions. We also noted that in patients planning to undergo surgery to correct significant kyphosis after OVF, several techniques, including multilevel fixation, cement augmentation, preservation of sagittal balance, and avoiding termination at the apex of kyphosis are necessary to prevent complications. Additionally, it became clear that there is no consensus to choose the type of open surgery (anterior, posterior, combined, using cement or bone or vertebral body cage, the levels, and kind of instrumentation). The current literature indicated that implant failure in the osteoporotic spine is a common complication, and many techniques have been described to prevent implant failure in the osteoporotic spine. However, the superiority of one method over another is unclear. CONCLUSIONS Open surgery for osteoporotic vertebral fractures should be considered if neurologic deficits and significant painful kyphosis. The apparent indications of surgery and most ideal surgical technique for OVF remain unclear in the literature; therefore, the decision must be individualized.
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Affiliation(s)
- Onur Yaman
- Memorial Bahçelievler Spine Center, Istanbul, Turkey -
| | - Mehmet Zileli
- Ege University Neurosurgery Department, Izmir, Turkey
| | - Salman Sharif
- Neurosurgery Department, Liaquat Hospital, Karachi, Pakistan
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21
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Liu H, Zhou ZY, Wei JX, Zhang M, Bai M, Huang AB. Comprehensive analysis of pedicle screw implantation in the C7 vertebra using computed tomography-based three-dimensional models. BMC Surg 2022; 22:96. [PMID: 35287657 PMCID: PMC8922919 DOI: 10.1186/s12893-022-01548-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2021] [Accepted: 03/07/2022] [Indexed: 11/10/2022] Open
Abstract
Background From a biomechanical point of view, pedicle screws (PS) are better than other kinds of screws for implantation in the seventh cervical vertebra (C7). However, the application of PS is limited because of the high risk of severe complications. It is essential to define the optimal entry point and trajectory. The aim of this study was to comprehensively analyze the starting point and trajectory for C7 PS insertion using three dimensional (3D) models. Methods Overall, 60 subjects aged 18 to 67 years old were included. All CT images were used to construct 3D computer models of the C7 vertebrae. A new coordinate system was established for the next evaluation. The pedicle axis was calculated with respect to the entire pedicle; then, the ideal entry point, screw diameter and length, sagittal angle and lateral angle were assessed. Results All the ideal entry points were located at the medial superior to lateral notch (LN), and the mean distance between the entry point and LN was 5.86 ± 1.67 mm in the horizontal direction and 3.47 ± 1.57 mm in the vertical direction. The mean distance between the entry point and the middle point of the inferior edge of the C6 articular process (MP) was 0.74 ± 1.83 mm in the horizontal direction. The mean sagittal angle of the pedicle axis was 90.42°, and the mean pedicle transverse angle was 30.70°. The average diameter and length of the PS were 6.51 ± 0.76 mm and 31.58 ± 4.40 mm, respectively. Conclusions This study provided a novel method to calculate the ideal starting point and trajectory for C7 PS insertion. These measurements may be helpful for preoperative planning. It is recommended that 3D CT imaging is used preoperatively to carefully evaluate the anatomy of each individual.
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Affiliation(s)
- Huan Liu
- Postgraduate School, Dalian Medical University, Dalian, 116000, Liaoning, China
| | - Zhi-Yong Zhou
- Postgraduate School, Dalian Medical University, Dalian, 116000, Liaoning, China
| | - Jia-Xu Wei
- Postgraduate School, Dalian Medical University, Dalian, 116000, Liaoning, China
| | - Ming Zhang
- Postgraduate School, Dalian Medical University, Dalian, 116000, Liaoning, China
| | - Meng Bai
- Postgraduate School, Dalian Medical University, Dalian, 116000, Liaoning, China
| | - Ai-Bing Huang
- Department of Orthopedics, Hospital Affiliated 5 to Nantong University (Taizhou People's Hospital), Taizhou, 225300, Jiangsu, China. .,Postgraduate School, Dalian Medical University, Dalian, 116000, Liaoning, China.
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22
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Improved fixation stability for repairing pedicle screw loosening using a modified cement filling technique in porcine vertebrae. Sci Rep 2022; 12:2739. [PMID: 35177724 PMCID: PMC8854567 DOI: 10.1038/s41598-022-06724-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2021] [Accepted: 02/04/2022] [Indexed: 01/20/2023] Open
Abstract
Polymethylmethacrylate (PMMA) has been applied clinically and biomechanically repair loose pedicle screws. Controversies have arisen over data due to uncontrolled cement properties, various locations and sizes of fenestrated holes in repair screws, irregular holes and different bone densities of specimens. In this study, the pullout strength was compared for two techniques, the modified technique to use PMMA to augment a threaded hole and the traditional technique with retrograde injection of a PMMA filling, for standard loose screws in porcine vertebrae. Both techniques provided statistically significant results for sufficiently randomized specimens and experimental procedures. The difference in the pullout strength between conical and cylindrical screws for the aforementioned cement augmentation techniques was also investigated. Twenty-four single-level fresh-frozen lumbar vertebrae from L1 to L6 were harvested from four mature pigs. A total of 0.8 ml of PMMA was retrograde injected into screw holes with a 5.5 mm diameter, followed by insertion of a 5.0 mm diameter repair screw in the traditional group (n = 12). A stiff threaded PMMA hole was created with a 4.5 mm tapping screw before insertion of repair screws in the modified group (n = 12). Two screw geometries were randomly assigned as cylindrical (n = 6) and conical (n = 6) in each group. The correlations between filling techniques, screw geometries and axial pullout strength were analyzed. An appropriate screw trajectory and insertion depth were confirmed using X-ray imaging prior to pullout testing in both groups. For a given screw geometry (cylindrical or conical), the pullout force of the modified group was significantly higher than that of the traditional group. There was no significant difference in the pullout force between the screw geometries for a given filling technique. The cement augmentation technique is far more influential than the screw outer geometry. The modified PMMA technique created a greater anchor force than the traditional method and could be an alternative for revision of pedicle screw loosening.
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23
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Han G, Zou D, Liu Z, Zhou S, Li W, Gong C, Sun Z, Li W. Paraspinal muscle characteristics on MRI in degenerative lumbar spine with normal bone density, osteopenia and osteoporosis: a case-control study. BMC Musculoskelet Disord 2022; 23:73. [PMID: 35057764 PMCID: PMC8780389 DOI: 10.1186/s12891-022-05036-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/06/2021] [Accepted: 01/17/2022] [Indexed: 11/26/2022] Open
Abstract
Background To investigate the difference of paraspinal muscles in patients with normal bone density, osteopenia and osteoporosis. Methods Patients undergoing surgery for lumbar spinal stenosis were included. Thirty-eight patients with osteoporosis were matched to patients with osteopenia and patients with normal bone density in a 1:1 manner according to WHO criteria. Dual-energy X-ray absorptiometry (DXA) scans and lumbar CT were performed preoperatively to measure the BMD of lumbar, femur and hip and HU values of L1-L4 respectively. The relative total cross-sectional area (rTCSA) and fat infiltration (FI) of multifidus (MF) and erector spinae (ES), and the relative functional CSA (rFCSA) of psoas major (PS) were measured at L4–5 and L5-S level on preoperative MRI. Results Osteoporotic patients showed lower BMI, higher MF FI and higher ES FI when compared with normal bone density group (25.57 ± 3.71 vs 27.46 ± 3.11; 0.38 ± 0.1 vs 0.32 ± 0.08; 0.33 ± 0.1 vs 0.28 ± 0.08; all adjusted p < 0.05). Both the MF FI and ES FI were significantly correlated with lumbar T-score (r = − 0.223, p < 0.05; r = − 0.208, p < 0.05) and the averaged lumbar HU value (r = − 0.305, p < 0.01; r = − 0.239, p < 0.05). Conclusions Osteoporosis and paraspinal muscle degeneration might interact with each other and coexist in patients with degenerative lumbar diseases. It is recommended that the paraspinal muscle degeneration should be considered simultaneously when finding a patient with low bone mass before surgery.
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24
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Jin D, Zheng H, Zhao Q, Wang C, Zhang M, Yuan H. Generation of Vertebra Micro-CT-like Image from MDCT: A Deep-Learning-Based Image Enhancement Approach. Tomography 2021; 7:767-782. [PMID: 34842849 PMCID: PMC8628970 DOI: 10.3390/tomography7040064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Revised: 11/05/2021] [Accepted: 11/09/2021] [Indexed: 11/26/2022] Open
Abstract
This paper proposes a deep-learning-based image enhancement approach that can generate high-resolution micro-CT-like images from multidetector computed tomography (MDCT). A total of 12,500 MDCT and micro-CT image pairs were obtained from 25 vertebral specimens. Then, a pix2pixHD model was trained and evaluated using the structural similarity index measure (SSIM) and Fréchet inception distance (FID). We performed subjective assessments of the micro-CT-like images based on five aspects. Micro-CT and micro-CT-like image-derived trabecular bone microstructures were compared, and the underlying correlations were analyzed. The results showed that the pix2pixHD method (SSIM, 0.804 ± 0.037 and FID, 43.598 ± 9.108) outperformed the two control methods (pix2pix and CRN) in enhancing MDCT images (p < 0.05). According to the subjective assessment, the pix2pixHD-derived micro-CT-like images showed no significant difference from the micro-CT images in terms of contrast and shadow (p > 0.05) but demonstrated slightly lower noise, sharpness and trabecular bone texture (p < 0.05). Compared with the trabecular microstructure parameters of micro-CT images, those of pix2pixHD-derived micro-CT-like images showed no significant differences in bone volume fraction (BV/TV) (p > 0.05) and significant correlations in trabecular thickness (Tb.Th) and trabecular spacing (Tb.Sp) (Tb.Th, R = 0.90, p < 0.05; Tb.Sp, R = 0.88, p < 0.05). The proposed method can enhance the resolution of MDCT and obtain micro-CT-like images, which may provide new diagnostic criteria and a predictive basis for osteoporosis and related fractures.
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Affiliation(s)
- Dan Jin
- Department of Radiology, Peking University Third Hospital, Beijing 100191, China; (D.J.); (Q.Z.); (C.W.); (M.Z.)
| | - Han Zheng
- School of Traffic and Transportation, Beijing Jiaotong University, Beijing 100044, China;
| | - Qingqing Zhao
- Department of Radiology, Peking University Third Hospital, Beijing 100191, China; (D.J.); (Q.Z.); (C.W.); (M.Z.)
| | - Chunjie Wang
- Department of Radiology, Peking University Third Hospital, Beijing 100191, China; (D.J.); (Q.Z.); (C.W.); (M.Z.)
| | - Mengze Zhang
- Department of Radiology, Peking University Third Hospital, Beijing 100191, China; (D.J.); (Q.Z.); (C.W.); (M.Z.)
| | - Huishu Yuan
- Department of Radiology, Peking University Third Hospital, Beijing 100191, China; (D.J.); (Q.Z.); (C.W.); (M.Z.)
- Correspondence:
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25
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Son HJ, Choi SH, Heo DR, Kook I, Lee MK, Ahn HS, Kang CN. Outcomes of the use of cement-augmented cannulated pedicle screws in lumbar spinal fusion. Spine J 2021; 21:1857-1865. [PMID: 33992795 DOI: 10.1016/j.spinee.2021.05.005] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/24/2020] [Revised: 04/29/2021] [Accepted: 05/04/2021] [Indexed: 02/03/2023]
Abstract
BACKGROUND CONTEXT There are few studies of the radio-clinical outcomes of cement-augmented cannulated pedicle screw (CPS) fixation in osteoporotic patients. PURPOSE To compare the radiological and clinical outcomes between groups receiving cement-augmented CPS and solid pedicle screws (SPS) in lumbar fusion surgery. STUDY DESIGN/SETTING Retrospective comparative study PATIENT SAMPLE: A total of 187 patients who underwent lumbar fusion surgery for degenerative spinal stenosis or spondylolisthesis from 2014 to 2019. OUTCOME MEASURES Radiological evaluation included screw failure, cage failure, rod breakage, and fusion grade at postoperative 6 months and 1 year. Pre- and postoperative visual analog scales for back pain (VAS-BP), leg pain (VAS-LP), Korean Oswestry disability index (K-ODI), and postoperative complications were also compared. METHODS Outcomes of patients with high risk factors for implant failure [old age, osteoporosis, autoimmune disease or chronic kidney disease (CKD)] who underwent open transforaminal lumbar interbody fusion with cement-augmented CPS fixation (Group C, n=55) or SPS fixation (Group S, n=132) were compared. RESULTS 324 pedicle screws in Group C and 775 pedicle screws in Group S were analyzed. Group C had a significantly higher average age and lower T-score, and included more patients with autoimmune disease and CKD than group S (all p<.05). Clear zones, screw migration and loss of correction were significantly less frequent in Group C (all p<.05). Thirteen screw breakages were observed; they were only in Group C (4.0%) and all were in the proximal of the two holes. Interbody and posterolateral fusion rates were not significantly different. At last follow-up, all clinical parameters including VAS-BP, VAS-LP, and K-ODI scores had improved significantly in both groups. Postoperative complications were not significantly different in the two groups. CONCLUSION In lumbar fusion surgery, using cement-augmented CPS in high-risk groups for implant failure could be a useful technical option for reducing acute radiological complications and obtaining clinical results comparable to those obtained using SPS in patients with low risk of implant failure. LEVEL OF EVIDENCE Level 4.
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Affiliation(s)
- Hee Jung Son
- Department of Orthopaedic Surgery, Hanyang University College of Medicine, Seoul, Republic of Korea
| | - Sung Hoon Choi
- Department of Orthopaedic Surgery, Hanyang University College of Medicine, Seoul, Republic of Korea
| | - Dong Ryul Heo
- Department of Orthopaedic Surgery, Hanyang University College of Medicine, Seoul, Republic of Korea
| | - Incheol Kook
- Department of Orthopaedic Surgery, Hanyang University College of Medicine, Seoul, Republic of Korea
| | - Myoung Keun Lee
- Department of Orthopaedic Surgery, Hanyang University College of Medicine, Seoul, Republic of Korea
| | - Hyung Seob Ahn
- Department of Orthopaedic Surgery, Hanyang University College of Medicine, Seoul, Republic of Korea
| | - Chang-Nam Kang
- Department of Orthopaedic Surgery, Hanyang University College of Medicine, Seoul, Republic of Korea.
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26
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Yang K, You Y, Wu W. The Influence of Different Injection Hole Designs of Augmented Pedicle Screws on Bone Cement Leakage and Distribution Patterns in Osteoporotic Patients. World Neurosurg 2021; 157:e40-e48. [PMID: 34583006 DOI: 10.1016/j.wneu.2021.09.086] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2021] [Revised: 09/16/2021] [Accepted: 09/17/2021] [Indexed: 10/20/2022]
Abstract
OBJECTIVE To compare cement distribution and leakage for 2 bone cement-augmented screws with different designs of injection holes in patients and the impact of screw locations and bone mineral density (BMD) on the results. METHODS This study recruited 40 patients who underwent instrumentation with cement-augmented screws. Screw holes of group A were 4 holes located in the distal one third of screws, while screw holes of group B were 6 holes located in distal, middle, and proximal sites. Postoperative computed tomography images were obtained to evaluate the rate and type of cement leakage and the distribution pattern of cement. The lateral or center position of screw tip, BMD, and T-score were also analyzed for their influence on the results. RESULTS Of 192 screws, 80 (41.7%) exhibited cement leakage on postoperative computed tomography. The incidence of cement distribution in the posterior half and type B leakage in group B was significantly higher compared with group A. In group A, the probability of cement distribution in the posterior half was significantly increased when the screw was laterally inserted. For both groups, the higher incidence of cement distribution in the posterior half was correlated with lower BMD and T-score. CONCLUSIONS Our results showed that screws with injection holes closer to the screw tip had higher incidences of distribution in the anterior half of the body and lower incidences of type B leakage. Patients with lower BMD and T-scores should be closely monitored, and a more centered position is recommended for screw insertion.
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Affiliation(s)
- Kaiyun Yang
- Institute of Stomatology, Shandong University, Jinan, China
| | - Yunhao You
- Department of Spine Surgery, Shandong University Qilu Hospital, Jinan, China
| | - Wenliang Wu
- Department of Spine Surgery, Shandong University Qilu Hospital, Jinan, China.
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27
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Yagi M, Ogiri M, Holy CE, Bourcet A. Comparison of clinical effectiveness of fenestrated and conventional pedicle screws in patients undergoing spinal surgery: a systematic review and meta-analysis. Expert Rev Med Devices 2021; 18:995-1022. [PMID: 34503387 DOI: 10.1080/17434440.2021.1977123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
INTRODUCTION Pedicle screws are commonly used for spinal procedures for fusion stability, which is particularly important in osteoporotic patients, who are at an increased risk of requiring revision procedures. AREAS COVERED A systematic review and meta-analysis were conducted to compare clinical effectiveness of conventional pedicle screws (CPS) vs fenestrated pedicle screws (FPS) in patients undergoing spinal surgery. Primary outcomes included screw loosening, revision surgeries (involving an implant) and reoperations (not involving intervention on an implant) in patients treated with CPS vs FPS, sub-stratified by with and without osteoporosis. Secondary outcomes included changes in pain scores. Forty-eight studies with 8,302 patients were included, with 1,565 (19.18%) treated with FPS and 6,710 (80.82%) treated with CPS. FPS was associated with a lower risk of screw loosening (p = 0.001) vs CPS. In the general population, there was a non-significant trend of lower revision rate, but no difference in reoperation rate, between patients treated with FPS vs CPS. In osteoporotic patients, revision rates were significantly lower for FPS vs CPS (p = 0.009). EXPERT OPINION This review suggests that FPS are effective for surgical fixation and reduce rates of screw loosening, and in osteoporotic patients, revision surgeries, compared to CPS.
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Affiliation(s)
- Mitsuru Yagi
- Department of Orthopedic Surgery, Keio University School of Medicine, Japan
| | - Mami Ogiri
- Division of the Chief Medical Officer, Johnson & Johnson K.K. Medical Company, Chiyoda, Tokyo, Japan
| | - Chantal E Holy
- Medical Devices, Johnson and Johnson Limited, New Brunswick, NJ, USA
| | - Anh Bourcet
- Health Economics & Market Access, Johnson & Johnson Medical Asia Pacific, Singapore, Singapore
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Chaichankul C, Srichandraphan N, Chaichankul C, Gajaseni P. A Progressive Paraplegic Patient with Thalassemia Because of Extramedullary Hematopoiesis and Vertebral Fracture: A Case Report. JBJS Case Connect 2021; 11:01709767-202109000-00110. [PMID: 37556798 DOI: 10.2106/jbjs.cc.21.00089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/11/2023]
Abstract
CASE We present a case of progressive paraplegia because of extramedullary hematopoiesis and pathological vertebral fracture in thalassemia patient. The various surgical techniques including larger pedicle screws, bicortical fixation, and convergent direction to improve pullout strength had been used secondary to osteoporotic bone and kyphotic deformity. CONCLUSION Prompt diagnosis and awareness of the compromised bone quality of the thalassemic patient is essential to guide the proper management and produce the desire outcomes.
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Affiliation(s)
- Chaisiri Chaichankul
- Department of Orthopaedics, Phramongkutklao Hospital and College of Medicine, Bangkok, Thailand
| | - Nattawat Srichandraphan
- Department of Orthopaedics, Phramongkutklao Hospital and College of Medicine, Bangkok, Thailand
| | | | - Pawin Gajaseni
- Department of Orthopaedics, Phramongkutklao Hospital and College of Medicine, Bangkok, Thailand
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29
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Viezens L, Sellenschloh K, Püschel K, Morlock MM, Lehmann W, Huber G, Weiser L. Impact of Screw Diameter on Pedicle Screw Fatigue Strength-A Biomechanical Evaluation. World Neurosurg 2021; 152:e369-e376. [PMID: 34087457 DOI: 10.1016/j.wneu.2021.05.108] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Revised: 05/22/2021] [Accepted: 05/24/2021] [Indexed: 11/28/2022]
Abstract
OBJECTIVE Loosening of pedicle screws is a frequently observed complication in spinal surgery. Because additional stabilization procedures such as cement augmentation or lengthening of the instrumentation involve relevant risks, optimal stability of the primarily implanted pedicle screw is of essential importance. The aim of the present study was to investigate the effect of increasing the screw diameter on pedicle screw stability. METHODS A total of 10 human cadaveric vertebral bodies (L4) were included in the present study. The bone mineral density was evaluated using quantitative computed tomography and the pedicle diameter using computed tomography. The vertebrae underwent instrumentation using 6.0-mm × 45-mm pedicle screws on 1 side and screws with the largest possible diameter (8-10-mm × 45-mm) on the other side. Fatigue testing was performed by applying a cyclic loading (craniocaudal sinusoidal 0.5 Hz) with increasing peak force (100 N + 0.1 N/cycle) until screw head displacement of 5.4 mm was reached. RESULTS The mean fatigue load was 334 N for the 6-mm diameter screws and was increased significantly to 454 N (+36%) for the largest possible diameter screws (P < 0.001). With an increase in the fatigue load by 52%, this effect was even more pronounced in vertebrae with reduced bone density (bone mineral density <120 mg/cm3; n = 7; P < 0.001). The stiffness of the construct was significantly greater in the largest diameter screw group compared with the standard screw group during the entire testing period (start, P < 0.001; middle, P < 0.001; end, P = 0.009). CONCLUSIONS Increasing the pedicle screw diameter from a standard 6-mm screw to the largest possible diameter (8-10 mm) led to a significantly greater fatigue load.
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Affiliation(s)
- Lennart Viezens
- Department of Trauma Surgery, Orthopaedic Surgery and Plastic Surgery, University Medical Center Göttingen, Göttingen, Germany; Division of Spine Surgery, Department of Trauma and Orthopaedic Surgery, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Kay Sellenschloh
- Institute of Biomechanics, Hamburg University of Technology, Hamburg, Germany
| | - Klaus Püschel
- Institute of Forensic Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Michael M Morlock
- Institute of Biomechanics, Hamburg University of Technology, Hamburg, Germany
| | - Wolfgang Lehmann
- Department of Trauma Surgery, Orthopaedic Surgery and Plastic Surgery, University Medical Center Göttingen, Göttingen, Germany
| | - Gerd Huber
- Institute of Biomechanics, Hamburg University of Technology, Hamburg, Germany
| | - Lukas Weiser
- Department of Trauma Surgery, Orthopaedic Surgery and Plastic Surgery, University Medical Center Göttingen, Göttingen, Germany.
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Weiser L, Huber G, Sellenschloh K, Püschel K, Morlock MM, Viezens L, Lehmann W. Rescue Augmentation: Increased Stability in Augmentation After Initial Loosening of Pedicle Screws. Global Spine J 2021; 11:679-685. [PMID: 32875910 PMCID: PMC8165920 DOI: 10.1177/2192568220919123] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
STUDY DESIGN Biomechanical study. OBJECTIVES Failure of pedicle screws is a major problem in spinal surgery not only postoperatively, but also intraoperatively. The aim of this study was to evaluate whether cement augmentation may restore mounting of initially loosened pedicle screws. METHODS A total of 14 osteoporotic or osteopenic human cadaveric vertebral bodies (L2)-according to quantitative computed tomography (QCT)-were instrumented on both sides by conventional pedicle screws and cement augmented on 1 side. In vitro fatigue loading (cranial-caudal sinusoidal, 0.5 Hz) with increasing peak force (100 N + 0.1 N/cycles) was applied until a screw head displacement of 5.4 mm (∼20°) was reached. After loosening, the nonaugmented screw was rescue augmented, and fatigue testing was repeated. RESULTS The fatigue load reached 207.3 N for the nonaugmented screws and was significantly (P = .009) exceeded because of initial cement augmentation (300.6 N). The rescue augmentation after screw loosening showed a fatigue load of 370.1 N which was significantly higher (P < .001) compared with the nonaugmented screws. The impact of bone density on fatigue strength decreased from the nonaugmented to the augmented to the rescue-augmented screws and shows the greatest effect of cement augmentation on fatigue strength at low bone density. CONCLUSIONS Rescue augmentation leads to similar or higher fatigue strengths compared with those of the initially augmented screws. Therefore, the cement augmentation of initially loosened pedicle screws is a promising option to restore adequate screw stability.
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Affiliation(s)
- Lukas Weiser
- Department of Trauma Surgery, Orthopaedic Surgery and Plastic Surgery, University Medical Center Göttingen, Göttingen, Germany,Lukas Weiser, Department of Trauma Surgery, Orthopaedic Surgery and Plastic Surgery, University Medical Center Göttingen, Robert Koch Str 40, 37099 Göttingen, Germany.
| | - Gerd Huber
- Institute of Biomechanics, TUHH Hamburg University of Technology, Hamburg, Germany
| | - Kay Sellenschloh
- Institute of Biomechanics, TUHH Hamburg University of Technology, Hamburg, Germany
| | - Klaus Püschel
- Institute of Forensic Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Michael M. Morlock
- Institute of Biomechanics, TUHH Hamburg University of Technology, Hamburg, Germany
| | - Lennart Viezens
- Department of Trauma Surgery, Orthopaedic Surgery and Plastic Surgery, University Medical Center Göttingen, Göttingen, Germany
| | - Wolfgang Lehmann
- Department of Trauma Surgery, Orthopaedic Surgery and Plastic Surgery, University Medical Center Göttingen, Göttingen, Germany
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Liang TZ, Zhu HP, Gao B, Peng Y, Gao WJ. Intracardiac, pulmonary cement embolism in a 67-year-old female after cement-augmented pedicle screw instrumentation: A case report and review of literature. World J Clin Cases 2021; 9:3120-3129. [PMID: 33969099 PMCID: PMC8080748 DOI: 10.12998/wjcc.v9.i13.3120] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Revised: 02/04/2021] [Accepted: 03/03/2021] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND We report a case of Intracardiac, pulmonary, and intravenous cement embolism after cement-augmented pedicle screw instrumentation in treating spondylolisthesis underlying osteoporotic bone, which was successfully managed by conservative treatment. We describe the treatment and outcome of the patient, hoping to shed light on the management of bone cement embolism.
CASE SUMMARY A 67-year-old female suffered from progressive low back pain and numbness in lower extremities for 30 years. She was diagnosed with L4 and L5 spondylolisthesis, spinal stenosis, and osteoporosis. The patient underwent spinal canal decompression, an interbody fusion of L4/5 and L5/S1, cement-augmented pedicle screw instrumentation in L4-L5 segments, and regular pedicle screw in S1 segments. Three days postoperatively, a sudden drop in oxygen saturation occurred. Computerized tomography scan confirmed Intracardiac, pulmonary, and intravenous embolism. The patient was treated conservatively by continuous low-flow oxygen inhalation, anti-coagulation, and antibiotic therapy for 1 mo and continued anticoagulation treatment for 6 mo. The patient showed no further symptoms in a 30-mo follow-up.
CONCLUSION Intracardiac, pulmonary cement embolism after cement-augmented pedicle screw instrumentation is extremely rare. Careful clinical and radiographic evaluation is required in multiple sites of bone cement embolism. Conservative treatment may be a primary consideration in scattered emboli without life-threatening conditions, but a clinical decision should be made on an individualized basis.
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Affiliation(s)
- Tong-Zhou Liang
- Department of Orthopedics, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou 510289, Guangdong Province, China
| | - Hai-Peng Zhu
- Department of Orthopedics, Guangdong Women and Children Hospital, Guangzhou 511400, Guangdong Province, China
| | - Bo Gao
- Department of Orthopedics, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou 510289, Guangdong Province, China
| | - Yan Peng
- Department of Orthopedics, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou 510289, Guangdong Province, China
| | - Wen-Jie Gao
- Department of Orthopedics, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou 510289, Guangdong Province, China
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Funk GA, Menuey EM, Ensminger WP, Kilway KV, McIff TE. Elution of rifampin and vancomycin from a weight-bearing silorane-based bone cement. Bone Joint Res 2021; 10:277-284. [PMID: 33845590 PMCID: PMC8077179 DOI: 10.1302/2046-3758.104.bjr-2020-0430.r1] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
AIMS Poly(methyl methacrylate) (PMMA)-based bone cements are the industry standard in orthopaedics. PMMA cement has inherent disadvantages, which has led to the development and evaluation of a novel silorane-based biomaterial (SBB) for use as an orthopaedic cement. In this study we test both elution and mechanical properties of both PMMA and SBB, with and without antibiotic loading. METHODS For each cement (PMMA or SBB), three formulations were prepared (rifampin-added, vancomycin-added, and control) and made into pellets (6 mm × 12 mm) for testing. Antibiotic elution into phosphate-buffered saline was measured over 14 days. Compressive strength and modulus of all cement pellets were tested over 14 days. RESULTS The SBB cement was able to deliver rifampin over 14 days, while PMMA was unable to do so. SBB released more vancomycin overall than did PMMA. The mechanical properties of PMMA were significantly reduced upon rifampin incorporation, while there was no effect to the SBB cement. Vancomycin incorporation had no effect on the strength of either cement. CONCLUSION SBB was found to be superior in terms of rifampin and vancomycin elution. Additionally, the incorporation of these antibiotics into SBB did not reduce the strength of the resultant SBB cement composite whereas rifampin substantially attenuates the strength of PMMA. Thus, SBB emerges as a potential weight-bearing alternative to PMMA for the local delivery of antibiotics. Cite this article: Bone Joint Res 2021;10(4):277-284.
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Affiliation(s)
- Grahmm August Funk
- Department of Orthopaedic Surgery, University of Kansas Medical Center, Kansas City, Kansas, USA
| | - Elizabeth M Menuey
- Department of Chemistry, University of Missouri-Kansas City, Kansas City, Missouri, USA
| | - William P Ensminger
- Department of Orthopaedic Surgery, University of Kansas Medical Center, Kansas City, Kansas, USA
| | - Kathleen V Kilway
- Department of Chemistry, University of Missouri-Kansas City, Kansas City, Missouri, USA
| | - Terence E McIff
- Department of Orthopaedic Surgery, University of Kansas Medical Center, Kansas City, Kansas, USA
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Can cavity-based pedicle screw augmentation decrease screw loosening? A biomechanical in vitro study. EUROPEAN SPINE JOURNAL : OFFICIAL PUBLICATION OF THE EUROPEAN SPINE SOCIETY, THE EUROPEAN SPINAL DEFORMITY SOCIETY, AND THE EUROPEAN SECTION OF THE CERVICAL SPINE RESEARCH SOCIETY 2020; 30:2283-2291. [PMID: 33355707 DOI: 10.1007/s00586-020-06676-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2019] [Revised: 10/08/2020] [Accepted: 11/22/2020] [Indexed: 10/22/2022]
Abstract
PURPOSE In an osteoporotic vertebral body, cement-augmented pedicle screw fixation could possibly be optimized by the creation of an initial cavity. The aim of this study is to compare three test groups with regard to their loosening characteristics under cyclic loading. METHODS Eighteen human, osteoporotic spine segments were divided in three groups. Flexibility tests and cyclic loading tests were performed with an internal fixator. The screws were fixed after creation a cavity and with cement (cavity-augmented group), without cavity and with cement (augmented group), and without cavity and without cement (control group). Cyclic loading up to 100,000 cycles was applied with a complex loading protocol. Screw loosening was measured with flexibility tests after implantation and after cyclic loading. Cement distribution was visualized from CT scans. RESULTS In all groups, range of motion increased during cyclic loading, representing significant screw loosening after 100,000 cycles. In both augmented groups, screw loosening was less pronounced than in the control group. The cavity-augmented group showed only a slight tendency of screw loosening, but with smaller variations compared to both other groups. This may be explained with a trend for a more equal and homogeneous cement volume around each tip for the cavity-augmented group. CONCLUSION This study demonstrated that creating a cavity may allow a more equal fixation of all pedicle screws with slight reduction of loosening. However, augmentation only through a cannulated screw is almost equivalent, if care is taken that enough cement volume can be pushed out around the tip of the screw.
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李 庆, 陈 浩, 刘 团, 何 立, 刘 鹏, 赵 元, 都 金, 邹 鹏, 张 正, 贺 宝, 杨 俊, 郝 定. [Polymethylmethacrylate-augmented screw fixation in treatment of senile thoracolumbar tuberculosis combined with severe osteoporosis]. ZHONGGUO XIU FU CHONG JIAN WAI KE ZA ZHI = ZHONGGUO XIUFU CHONGJIAN WAIKE ZAZHI = CHINESE JOURNAL OF REPARATIVE AND RECONSTRUCTIVE SURGERY 2020; 34:1526-1532. [PMID: 33319530 PMCID: PMC8171576 DOI: 10.7507/1002-1892.202006014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Revised: 09/24/2020] [Indexed: 11/03/2022]
Abstract
OBJECTIVE To explore the safety and effectiveness of polymethylmethacrylate-augmented screw fixation (PASF) in the treatment of elderly thoracolumbar tuberculosis combined with severe osteoporosis. METHODS The clinical data of 20 elderly patients with thoracolumbar tuberculosis and severe osteoporosis who underwent PASF after anterior or posterior debridement and bone grafting and met the selection criteria between December 2012 and December 2014 were retrospectively analyzed. There were 8 males and 12 females with an average age of 68.5 years (range, 65-72 years). T value of bone mineral density was -4.2 to -3.6, with an average of -3.9. There were 12 cases of thoracic tuberculosis, 3 cases of thoracolumbar tuberculosis, and 5 cases of lumbar tuberculosis. The diseased segments involved T 3-L 4, including 11 cases of single-segment disease, 6 cases of double-segment disease, and 3 cases of multi-segment disease. The disease duration was 3-9 months, with an average of 6 months. The preoperative spinal nerve function of the patients was evaluated by the American Spinal Injury Association (ASIA) grading. There were 2 cases of grade A, 5 cases of grade B, 6 cases of grade C, 4 cases of grade D, and 3 cases of grade E. Postoperative imaging examination was used to evaluate the bone graft fusion and paravertebral abscess absorption, and to measure the Cobb angle of the segment to evaluate the improvement of kyphosis. The levels of erythrocyte sedimentation rate (ESR) and C-reactive protein (CRP) were tested. The visual analogue scale (VAS) score, Oswestry disability index (ODI), and ASIA grading were used to evaluate the effectivreness before operation, at 1 month after operation, and at last follow-up. The clinical cure of tuberculosis was also evaluated. RESULTS All operation successfully completed. The operation time was 154-250 minutes, with an average of 202 minutes; the intraoperative blood loss was 368-656 mL, with an average of 512 mL. All 20 patients were followed up 18-42 months, with an average of 26.8 months. The postoperative pain and symptoms of tuberculosis in all patients relieved, and the paravertebral abscess was absorbed, reaching the cure standard for spinal tuberculosis. All bone grafts fusion achieved within 1 year after operation. Only 1 case had asymptomatic bone cement leakage into the paravertebral veins, and the remaining patients had no serious complications such as bone cement leakage in the spinal canal, pulmonary embolism, and neurovascular injury. At last follow-up, spinal cord nerve function significantly improved when compared with preoperative one. Among them, ASIA grading were 7 cases of grade C, 8 cases of grade D, and 5 cases of grade E, showing significant difference when compared with preoperative one ( Z=2.139, P=0.000). VAS score, ODI score, segmental Cobb angle, ESR, and CRP at 1 month after operation and at last follow-up were significantly improved when compared with preoperative ones ( P<0.05); there was no significant difference between 1 month after operation and last follow-up ( P>0.05). During the follow-up, no complications such as failure of internal fixation, proximal junctional kyphosis, or tuberculosis recurrence occurred. CONCLUSION For elderly patients with thoracolumbar tuberculosis and severe osteoporosis, PASF treatment is safe and effective.
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Affiliation(s)
- 庆达 李
- 延安大学(陕西延安 716000)Yan’an University, Yan’an Shaanxi, 716000, P.R.China
- 西安交通大学附属红会医院脊柱外科(西安 710054)Department of Spinal Surgery, Honghui Hospital Affiliated to Medical School of Xi’an Jiaotong University, Xi’an Shaanxi, 710054, P.R.China
| | - 浩 陈
- 延安大学(陕西延安 716000)Yan’an University, Yan’an Shaanxi, 716000, P.R.China
| | - 团江 刘
- 延安大学(陕西延安 716000)Yan’an University, Yan’an Shaanxi, 716000, P.R.China
| | - 立民 何
- 延安大学(陕西延安 716000)Yan’an University, Yan’an Shaanxi, 716000, P.R.China
| | - 鹏 刘
- 延安大学(陕西延安 716000)Yan’an University, Yan’an Shaanxi, 716000, P.R.China
| | - 元廷 赵
- 延安大学(陕西延安 716000)Yan’an University, Yan’an Shaanxi, 716000, P.R.China
| | - 金鹏 都
- 延安大学(陕西延安 716000)Yan’an University, Yan’an Shaanxi, 716000, P.R.China
| | - 鹏 邹
- 延安大学(陕西延安 716000)Yan’an University, Yan’an Shaanxi, 716000, P.R.China
| | - 正平 张
- 延安大学(陕西延安 716000)Yan’an University, Yan’an Shaanxi, 716000, P.R.China
| | - 宝荣 贺
- 延安大学(陕西延安 716000)Yan’an University, Yan’an Shaanxi, 716000, P.R.China
| | - 俊松 杨
- 延安大学(陕西延安 716000)Yan’an University, Yan’an Shaanxi, 716000, P.R.China
| | - 定均 郝
- 延安大学(陕西延安 716000)Yan’an University, Yan’an Shaanxi, 716000, P.R.China
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Liu YY, Xiao J, Jin HJ, Wang Z, Yin X, Liu MY, Zhao JH, Liu P, Dai F. Comparison of unilateral and bilateral polymethylmethacrylate-augmented cannulated pedicle screw fixation for the management of lumbar spondylolisthesis with osteoporosis. J Orthop Surg Res 2020; 15:446. [PMID: 32993741 PMCID: PMC7526218 DOI: 10.1186/s13018-020-01975-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/19/2020] [Accepted: 09/23/2020] [Indexed: 12/17/2022] Open
Abstract
Background Cannulated pedicle screw (CPS) augmented by polymethylmethacrylate (PMMA) can achieve satisfactory clinical efficacy in the treatment of lumbar spondylolisthesis with osteoporosis. However, accurate application of CPSs will help to avoid the difficulty of screw revision and reduce the incidence of PMMA-related complications. This study aimed to investigate the mid-term efficacy of CPS compared to unilateral and bilateral applications in this common lumbar degenerative disease. Methods May 2011 and May 2018, 50 patients with lumbar spondylolisthesis with osteoporosis who underwent posterior fixation and fusion using traditional pedicle screws or CPSs were included in the study. Patients were divided into two groups based on the application: the unilateral PMMA-augmented CPS group (UC, n = 29) and the bilateral PMMA-augmented CPS group (BC, n = 21). Operation time, blood loss, average hospitalization time, PMMA leakage, and other complications were recorded. The visual analog scale (VAS) and Oswestry disability index (ODI) scores were used to evaluate symptom recovery. Radiographic results were compared for intervertebral fusion and screw loosening. Results There were no significant differences in the baseline data of the two groups. The VAS and ODI scores improved significantly after surgery (P < 0.05), with no significant differences between the groups (P > 0.05). The operation time and blood loss in the UC group were significantly lower than those in the BC group (P < 0.05). However, the loss of intervertebral disk height and Taillard index did not differ significantly between the groups. The rates of PMMA leakage in the UC and BC groups were 7.0% and 11.9%, respectively (P < 0.05). Bony fusion was achieved in all groups without screw loosening at the last follow-up. Only one patient experienced superficial infection in both groups, while cerebrospinal fluid leakage was observed in two patients in the BC group. Conclusions Unilateral application of PMMA-augmented CPS may provide adequate clinical safety and effectiveness in the surgical treatment of lumbar spondylolisthesis with osteoporosis.
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Affiliation(s)
- Yao-Yao Liu
- Department of Spine Surgery, Army Medical Center of PLA, No. 10 Changjiang Road, Yuzhong District, Chongqing, 400042, People's Republic of China
| | - Jun Xiao
- Department of Orthopedics, Southwest Hospital of Army Medical University, PLA, No. 30 Gaotanyan Street, Shapingba District, Chongqing, 400038, People's Republic of China
| | - Huai-Jian Jin
- Department of Spine Surgery, Army Medical Center of PLA, No. 10 Changjiang Road, Yuzhong District, Chongqing, 400042, People's Republic of China
| | - Zhong Wang
- Department of Spine Surgery, Army Medical Center of PLA, No. 10 Changjiang Road, Yuzhong District, Chongqing, 400042, People's Republic of China
| | - Xiang Yin
- Department of Spine Surgery, Army Medical Center of PLA, No. 10 Changjiang Road, Yuzhong District, Chongqing, 400042, People's Republic of China
| | - Ming-Yong Liu
- Department of Spine Surgery, Army Medical Center of PLA, No. 10 Changjiang Road, Yuzhong District, Chongqing, 400042, People's Republic of China
| | - Jian-Hua Zhao
- Department of Spine Surgery, Army Medical Center of PLA, No. 10 Changjiang Road, Yuzhong District, Chongqing, 400042, People's Republic of China
| | - Peng Liu
- Department of Spine Surgery, Army Medical Center of PLA, No. 10 Changjiang Road, Yuzhong District, Chongqing, 400042, People's Republic of China.
| | - Fei Dai
- Department of Orthopedics, Southwest Hospital of Army Medical University, PLA, No. 30 Gaotanyan Street, Shapingba District, Chongqing, 400038, People's Republic of China.
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Weiser L, Sellenschloh K, Püschel K, Morlock MM, Viezens L, Lehmann W, Huber G. Cortical threaded pedicle screw improves fatigue strength in decreased bone quality. EUROPEAN SPINE JOURNAL : OFFICIAL PUBLICATION OF THE EUROPEAN SPINE SOCIETY, THE EUROPEAN SPINAL DEFORMITY SOCIETY, AND THE EUROPEAN SECTION OF THE CERVICAL SPINE RESEARCH SOCIETY 2020; 30:128-135. [DOI: 10.1007/s00586-020-06593-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Revised: 08/03/2020] [Accepted: 09/04/2020] [Indexed: 12/30/2022]
Abstract
Abstract
Purpose
Inadequate anchoring of pedicle screws in vertebrae with poor bone quality is a major problem in spine surgery. The aim was to evaluate whether a modified thread in the area of the pedicle could significantly improve the pedicle screw fatigue strength.
Methods
Fourteen human cadaveric vertebral bodies (L2 and L3) were used for in vitro testing. Bone density (BMD) was determined by quantitative computed tomography. Vertebral bodies were instrumented by standard pedicle screws with a constant double thread on the right pedicle and a partial doubling of the threads–quad thread–(cortical thread) in the area of the pedicle on the left pedicle. Pulsating sinusoidal, cyclic load (0.5 Hz) with increasing peak force (100 N + 0.1 N/cycles) was applied orthogonal to the screw axis. The baseline force remained constant (50 N). Fatigue test was terminated after exceeding 5.4-mm head displacement (~ 20° screw tilting).
Results
The mean fatigue load at failure was 264.9 N (1682 cycles) for the standard screws and was increased significantly to 324.7 N (2285 cycles) by the use of cortical threaded screws (p = 0.014). This effect is particularly evident in reduced BMD (standard thread 241.2 N vs. cortical thread 328.4 N; p = 0.016), whereas in the group of vertebrae with normal BMD no significant difference could be detected (standard thread 296.5 N vs. cortical thread 319.8 N; p = 0.463).
Conclusions
Compared to a conventional pedicle screw, the use of a cortical threaded pedicle screw promises superior fatigue load in vertebrae with reduced bone quality.
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Akgül T, Korkmaz M, Pehlivanoglu T, Bayram S, Özdemir MA, Karalar Ş. Biomechanical Comparison of Pull-out Strength of Different Cementation and Pedicle Screw Placement Techniques in a Calf Spine Model. Indian J Orthop 2020; 54:134-140. [PMID: 32952921 PMCID: PMC7474045 DOI: 10.1007/s43465-020-00199-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/01/2020] [Accepted: 07/11/2020] [Indexed: 02/04/2023]
Abstract
BACKGROUND We hypothesized that an entire pedicle screw tract cement augmentation has greater strength than traditional techniques. METHOD Twenty-four fresh frozen calf lumbar spines were randomized into three study groups, each having eight vertebrae: (1) screw cemented after vertebroplasty; (2) fenestrated cemented screw; and (3) cementation of the entire pedicle screw tract. For the right side screws, two pedicle screws were inserted in each vertebra with the standard position in the sagittal plane, whereas the left side screws were placed at a 30° angle craniocaudal plane. From the recorded force-displacement curves, the maximum peak load (failure load) of each screw was determined. The mode of failure was screw stripping at all levels tested. RESULTS The pull-out strength for standard screw replacement at the sagittal plane was 1843.3 N, 1707.45 N, and 5365.1 N consecutively. The failure load value in the standard position in the sagittal plane in the cementation of the entire pedicle screw tract group was significantly higher than that in the fenestrated cemented screw group and screw cemented after vertebroplasty (p < 0.001 and p < 0.001, respectively). The standard pedicle screw position in the sagittal plane showed a significant pull-out strength than the others (p < 0.001). CONCLUSION The pull-out strength of the cementation of the entire pedicle screw tract was 2.5 times higher than the others. The pull-out strength of the pedicle screws in malposition obtained the same strength to the standard positions after the augmentation procedure in our study.
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Affiliation(s)
- Turgut Akgül
- Department of Orthopedics and Traumatology, Faculty of Medicine, Istanbul University, Çapa Fatih, Istanbul, 34093 Turkey
| | - Murat Korkmaz
- Department of Orthopedics and Traumatology, Faculty of Medicine, KOÇ University, Istanbul, Turkey
| | - Tuna Pehlivanoglu
- Department of Orthopedics and Traumatology, Emsey Hospital, Istanbul, Turkey
| | - Serkan Bayram
- Department of Orthopedics and Traumatology, Faculty of Medicine, Istanbul University, Çapa Fatih, Istanbul, 34093 Turkey
| | - Mustafa Abdullah Özdemir
- Department of Orthopedics and Traumatology, Faculty of Medicine, Istanbul University, Çapa Fatih, Istanbul, 34093 Turkey
| | - Şahin Karalar
- Department of Orthopedics and Traumatology, Faculty of Medicine, Istanbul University, Çapa Fatih, Istanbul, 34093 Turkey
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Use of longer sized screws is a salvage method for broken pedicles in osteoporotic vertebrae. Sci Rep 2020; 10:10441. [PMID: 32591573 PMCID: PMC7320151 DOI: 10.1038/s41598-020-67489-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Accepted: 06/05/2020] [Indexed: 11/09/2022] Open
Abstract
Screw loosening due to broken pedicles is a common complication resulting from the insertion of screws either with inadequate diameters or into an osteoporotic pedicle. In this novel in vitro study, we tried to clarify the contribution of the pedicle to screw fixation and subsequent salvage strategies using longer or larger-diameter screws in broken pedicles. Sixty L4 fresh-frozen lumbar vertebrae harvested from mature pigs were designed as the normal-density group (n = 30) and decalcified as the osteoporosis group (n = 30). Three modalities were randomly assigned as intact pedicle (n = 30), semi-pedicle (n = 15), and non-pedicle (n = 15) in each group. Three sizes of polyaxial screws (diameter × length of 6.0 mm × 45 mm, 6.0 mm × 50 mm, and 6.5 mm × 45 mm) over five trials were used in each modality. The associations between bone density, pedicle modality and screw pullout strength were analyzed. After decalcification for 4 weeks, the area bone mineral density decreased to approximately 56% (p < 0.05) of the normal-density group, which was assigned as the osteoporosis group. An appropriate screw trajectory and insertional depth were confirmed using X-ray imaging prior to pullout testing in both groups. The pullout forces of larger-diameter screws (6.5 mm × 45 mm) and longer screws (6.0 mm × 50 mm) were significantly higher (p < 0.05) in the semi- and non-pedicle modalities in the normal-density group, whereas only longer screws (6.0 mm × 50 mm) had a significantly higher (p < 0.05) pullout force in the non-pedicle modalities in the osteoporosis group. The pedicle plays an important role in both the normal bone density group and the osteoporosis group, as revealed by analyzing the pullout force percentage contributed by the pedicle. Use of a longer screw would be a way to salvage a broken pedicle of osteoporotic vertebra.
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Abstract
PURPOSE OF REVIEW To provide information on characteristics and use of various ceramics in spine fusion and future directions. RECENT FINDINGS In most recent years, focus has been shifted to the use of ceramics in minimally invasive surgeries or implementation of nanostructured surface modification features to promote osteoinductive properties. In addition, effort has been placed on the development of bioactive synthetics. Core characteristic of bioactive synthetics is that they undergo change to simulate a beneficial response within the bone. This change is based on chemical reaction and various chemical elements present in the bioactive ceramics. Recently, a synthetic 15-amino acid polypeptide bound to an anorganic bone material which mimics the cell-binding domain of type-I collagen opened a possibility for osteogenic and osteoinductive roles of this hybrid graft material. Ceramics have been present in the spine fusion arena for several decades; however, their use has been limited. The major obstacle in published literature is small sample size resulting in low evidence and a potential for bias. In addition, different physical and chemical properties of various ceramics further contribute to the limited evidence. Although ceramics have several disadvantages, they still hold a great promise as a value-based graft material with being easily available, relatively inexpensive, and non-immunogenic.
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Li W, Gao R, Xin T, Gao P. Different expression levels of interleukin-35 in asthma phenotypes. Respir Res 2020; 21:89. [PMID: 32295589 PMCID: PMC7160921 DOI: 10.1186/s12931-020-01356-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2019] [Accepted: 04/06/2020] [Indexed: 12/24/2022] Open
Abstract
Background Interleukin (IL)-35 is a newly discovered inhibitory cytokine which is produced by regulatory B and T lymphocytes and belongs to the IL-12 family. It plays a suppressive role in human inflammatory diseases; however, its role in asthma phenotypes is unclear. Our study focuses on the sputum IL-35 level in patients and investigates different airway inflammation capacities of sputum IL-35 in patients with different asthma phenotypes. Objective We aimed to determine the sputum IL-35 levels in asthmatic patients with clinical remission phenotypes and control subjects and to investigate possible correlations among lung function, age, sex, fractional exhaled nitric oxide (FeNO), and smoking history in these phenotypes. Methods Sputum samples were collected from patients with clinical asthma remission (n = 89, 37 males, age 52.24 ± 13.32 years) and a healthy control group (n = 19, 9 males, age 44.58 ± 16.3 years). All subjects underwent sputum induction. Induced sputum was assessed for inflammatory cell count, and sputum levels of IL-35 and other cytokines were measured by ELISA and Cytometric Bead Array, respectively. Results Sputum IL-35 (median (q1, q3)) levels showed no significant difference between asthma patients (4.89 ng/mL (2.97, 22.75)) and healthy controls (6.01 ng/mL (4.09, 30.47)). However, the sputum IL-35 level was significantly reduced in patients with eosinophilic asthma (EA) (3.95 ng/mL (2.80, 11.00)) compared to patients with neutrophilic asthma (NA) (40.59 ng/mL (20.59, 65.06), p = 0.002), paucigranulocytic asthma (PA) (6.25 ng/mL (3.10, 24.60), p = 0.012), and mixed granulocytic asthma (MA) (22.54 ng/mL (2.58, 52.45), p = 0.026). IL-35 levels in sputum showed a positive correlation with sputum neutrophil cells and a negative correlation with FeNO, FEV1% predicted, and FVC predicted. Furthermore, sputum IL-35 had a significant positive association with Th1-related factors and a negative correlation with Th2-related factors. Conclusions Sputum IL-35 is likely involved in different pathophysiological mechanisms of NA and EA and exerts different effects in asthma phenotypes.
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Affiliation(s)
- Wei Li
- Department of Respiratory and Critical Care Medicine, The Second Hospital of Jilin University, Changchun, Jilin, 130041, China
| | - Ruihan Gao
- Department of Medical Laboratory Technology, Beihua University, Jilin, 132013, Jilin, China
| | - Tong Xin
- Department of Respiratory, Xinqiao Hospital, Army Medical University (Third Military Medical University), Chongqing, 400037, China
| | - Peng Gao
- Department of Respiratory and Critical Care Medicine, The Second Hospital of Jilin University, Changchun, Jilin, 130041, China.
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Zou D, Sun Z, Zhou S, Zhong W, Li W. Hounsfield units value is a better predictor of pedicle screw loosening than the T-score of DXA in patients with lumbar degenerative diseases. EUROPEAN SPINE JOURNAL : OFFICIAL PUBLICATION OF THE EUROPEAN SPINE SOCIETY, THE EUROPEAN SPINAL DEFORMITY SOCIETY, AND THE EUROPEAN SECTION OF THE CERVICAL SPINE RESEARCH SOCIETY 2020; 29:1105-1111. [PMID: 32211997 DOI: 10.1007/s00586-020-06386-8] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2019] [Accepted: 03/18/2020] [Indexed: 02/07/2023]
Abstract
PURPOSE To compare the performance of using Hounsfield units (HU) value derived from computed tomography and T-score of dual-energy X-ray absorptiometry (DXA) to predict pedicle screw loosening. METHODS We reviewed 253 patients aged ≥ 50 years undergoing pedicle screw fixation for lumbar degenerative diseases (LDD). The evaluation of screw loosening: radiolucent zones of ≥ 1 mm thick in X-ray. The criterion for osteoporosis: the lowest T-score ≤ - 2.5. The average HU value of L1-L4 was used to represent lumbar bone mineral density (BMD). The area under receiver operating characteristics curve (AUC) was used to evaluate the performance of predicting screw loosening. RESULTS One patient underwent reoperation for screw loosening at 9 months follow-up. At 12 months follow-up, the loosening rate was 30.6% (77/252) in the remaining 252 patients. Osteoporotic patients had higher loosening rate than non-osteoporotic patients (39.3% vs. 25.8%, P = 0.026). The T-score showed no significant difference between loosening group and non-loosening group (- 2.1 ± 1.5 vs. - 1.7 ± 1.6, P = 0.074), and so is the lowest lumbar BMD of DXA (0.83 ± 0.16 g/cm2 vs. 0.88 ± 0.19 g/cm2, P = 0.054). The HU value was lower in the loosening group (106.8 ± 34.4 vs. 129.8 ± 45.7, P < 0.001). The HU value (OR, 0.980; 95%CI 0.968-0.993; P = 0.002) was the independent influencing factor of screw loosening. The AUC of predicting screw loosening was 0.666 (P < 0.001) for HU value and 0.574 (P = 0.062) for T-score. CONCLUSIONS HU value is a better predictor of pedicle screw loosening than T-score of DXA in patients aged ≥ 50 years with LDD. We should not only focus on the DXA measurements when making surgical plans concerning lumbar fixation. These slides can be retrieved under Electronic Supplementary Material.
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Affiliation(s)
- Da Zou
- Orthopaedic Department, Peking University Third Hospital, No. 49 North Garden Road, Haidian District, Beijing, 100191, China
| | - Zhuoran Sun
- Orthopaedic Department, Peking University Third Hospital, No. 49 North Garden Road, Haidian District, Beijing, 100191, China
| | - Siyu Zhou
- Orthopaedic Department, Peking University Third Hospital, No. 49 North Garden Road, Haidian District, Beijing, 100191, China
| | - Woquan Zhong
- Orthopaedic Department, Peking University Third Hospital, No. 49 North Garden Road, Haidian District, Beijing, 100191, China
| | - Weishi Li
- Orthopaedic Department, Peking University Third Hospital, No. 49 North Garden Road, Haidian District, Beijing, 100191, China.
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Weiser L, Sellenschloh K, Püschel K, Morlock MM, Viezens L, Lehmann W, Huber G. Reduced cement volume does not affect screw stability in augmented pedicle screws. EUROPEAN SPINE JOURNAL : OFFICIAL PUBLICATION OF THE EUROPEAN SPINE SOCIETY, THE EUROPEAN SPINAL DEFORMITY SOCIETY, AND THE EUROPEAN SECTION OF THE CERVICAL SPINE RESEARCH SOCIETY 2020; 29:1297-1303. [DOI: 10.1007/s00586-020-06376-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Revised: 03/05/2020] [Accepted: 03/11/2020] [Indexed: 12/16/2022]
Abstract
Abstract
Purpose
Cement augmentation of pedicle screws is able to improve screw anchorage in osteoporotic vertebrae but is associated with a high complication rate. The goal of this study was to evaluate the impact of different cement volumes on pedicle screw fatigue strength.
Methods
Twenty-five human vertebral bodies (T12–L4) were collected from donors between 73 and 97 years of age. Bone density (BMD) was determined by quantitative computed tomography. Vertebral bodies were instrumented by conventional pedicle screws, and unilateral cement augmentation was performed. Thirteen vertebrae were augmented with a volume of 1 ml and twelve with a volume of 3 ml bone cement. A fatigue test was performed using a cranial–caudal sinusoidal, cyclic load (0.5 Hz) with increasing compression force (100 N + 0.1 N/cycles).
Results
The load to failure was 183.8 N for the non-augmented screws and was increased significantly to 268.1 N (p < 0.001) by cement augmentation. Augmentation with 1 ml bone cement increased the fatigue load by 41% while augmentation with 3 ml increased the failure load by 51% compared to the non-augmented screws, but there was no significant difference in fatigue loads between the specimens with screws augmented with 1 ml and screws augmented with 3 ml of bone cement (p = 0.504).
Conclusion
Cement augmentation significantly increases pedicle screw stability. The benefit of augmentation on screw anchorage was not significantly affected by reducing the applied volume of cement from 3 ml to 1 ml. Considering the high risk of cement leakage during augmentation, we recommend the usage of a reduced volume of 1 ml bone cement for each pedicle screw.
Graphic Abstract
These slides can be retrieved under Electronic Supplementary Material .
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Rometsch E, Spruit M, Zigler JE, Menon VK, Ouellet JA, Mazel C, Härtl R, Espinoza K, Kandziora F. Screw-Related Complications After Instrumentation of the Osteoporotic Spine: A Systematic Literature Review With Meta-Analysis. Global Spine J 2020; 10:69-88. [PMID: 32002352 PMCID: PMC6963360 DOI: 10.1177/2192568218818164] [Citation(s) in RCA: 56] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
STUDY DESIGN Systematic literature review with meta-analysis. OBJECTIVE Osteoporosis is common in elderly patients, who frequently suffer from spinal fractures or degenerative diseases and often require surgical treatment with spinal instrumentation. Diminished bone quality impairs primary screw purchase, which may lead to loosening and its sequelae, in the worst case, revision surgery. Information about the incidence of spinal instrumentation-related complications in osteoporotic patients is currently limited to individual reports. We conducted a systematic literature review with the aim of quantifying the incidence of screw loosening in osteoporotic spines. METHODS Publications on spinal instrumentation of osteoporotic patients reporting screw-related complications were identified in 3 databases. Data on screw loosening and other local complications was collected. Pooled risks of experiencing such complications were estimated with random effects models. Risk of bias in the individual studies was assessed with an adapted McHarm Scale. RESULTS From 1831 initial matches, 32 were eligible and 19 reported screw loosening rates. Studies were heterogeneous concerning procedures performed and risk of bias. Screw loosening incidences were variable with a pooled risk of 22.5% (95% CI 10.8%-36.6%, 95% prediction interval [PI] 0%-81.2%) in reports on nonaugmented screws and 2.2% (95% CI 0.0%-7.2%, 95% PI 0%-25.1%) in reports on augmented screws. CONCLUSIONS The findings of this meta-analysis suggest that screw loosening incidences may be considerably higher in osteoporotic spines than with normal bone mineral density. Screw augmentation may reduce loosening rates; however, this requires confirmation through clinical studies. Standardized reporting of prespecified complications should be enforced by publishers.
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Affiliation(s)
- Elke Rometsch
- AO Foundation, Dübendorf, Switzerland,Elke Rometsch, AO Foundation, AO Clinical Investigation and Documentation (AOCID), Stettbachstrasse 6, 8600 Dübendorf, Switzerland.
| | | | | | | | | | | | - Roger Härtl
- NY Presbyterian Hospital–Weill Cornell Medical College, New York, NY, USA
| | | | - Frank Kandziora
- Center for Spine Surgery and Neurotraumatology, Frankfurt, Germany
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Comparison of Implant Failure between Cement Augmented Cannulated Pedicle Screws and Solid Pedicle Screws and Associated Risk Factors in Lumbar Fusion Surgery: A Pilot Study. ACTA ACUST UNITED AC 2020. [DOI: 10.4184/jkss.2020.27.3.89] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Ishak B, Bajwa AA, Schneider T, Tubbs RS, Iwanaga J, Ramey WL, Unterberg AW, Kiening KL. Early Complications and Cement Leakage in Elderly Patients Who Have Undergone Intraoperative Computed Tomography (CT)-Guided Cement Augmented Pedicle Screw Placement: Eight-Year Single-Center Experience. World Neurosurg 2019; 128:e975-e981. [DOI: 10.1016/j.wneu.2019.05.047] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2019] [Revised: 05/04/2019] [Accepted: 05/06/2019] [Indexed: 12/12/2022]
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Huang X, Huang Z, Xu L, Liang D, Zhang M, Zhang H. Pullout strength of reinserted pedicle screws using the previous entry point and trajectory. J Orthop Surg Res 2019; 14:205. [PMID: 31272476 PMCID: PMC6611027 DOI: 10.1186/s13018-019-1240-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/19/2019] [Accepted: 06/13/2019] [Indexed: 11/10/2022] Open
Abstract
PURPOSE This study compared the biomechanics of reinserted pedicle screws using the previous entry point and trajectory with those of correctly inserted pedicle screws. METHODS The study used 18 lumbar vertebrae (L1-6) from three fresh calf spines to insert 6.5 × 40-mm pedicle screws. A control screw was inserted correctly along the axis of one pedicle, while an experimental screw was reinserted completely using the previous entry point and trajectory in the other pedicle. The experimental screw was removed after being completely inserted in group A and after 80% of the total trajectory inserted in group B. And the experimental screw was removed after 60% of the total trajectory was reached in group C. The biomechanical values of the pedicle screws were measured. RESULTS There were no significant differences in pedicle screw axial pullout strength between reinserted screws and correct screws in the 3 groups (PA = 0.463, PB = 0.753, PC = 0.753). Stiffness measurement increased for the reinserted screw compared with that of the control screw. Fracturing was observed between the vertebral body and pedicle. CONCLUSION Theoretically, a surgeon can remove the pedicle screw when necessary, inspect the trajectory, and reinsert the screw using the previous entry point and trajectory.
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Affiliation(s)
- Xuanwu Huang
- Department of Orthopedics, Zhujiang Hospital, Southern Medical University, No. 253, Gongye Road, Haizhu District, Guangzhou, 510282, China
| | - Zixiang Huang
- Department of Spine Surgery, Guangdong Second Provincial General Hospital, No. 466, Xingang Road, Haizhu District, Guangzhou, 510317, China
| | - Liwei Xu
- The Second School of Clinical Medicine, Southern Medical University, No. 253, Gongye Road, Haizhu District, Guangzhou, 510282, China.,Department of Spine Surgery, Guangdong Second Provincial General Hospital, No. 466, Xingang Road, Haizhu District, Guangzhou, 510317, China
| | - Dongzhu Liang
- Guangdong Provincial Key Laboratory of Medical Biomechanics, Department of Anatomy, Southern Medical University, Guangzhou, China
| | - Meichao Zhang
- Guangdong Provincial Key Laboratory of Medical Biomechanics, Department of Anatomy, Southern Medical University, Guangzhou, China
| | - Hui Zhang
- The Second School of Clinical Medicine, Southern Medical University, No. 253, Gongye Road, Haizhu District, Guangzhou, 510282, China. .,Department of Spine Surgery, Guangdong Second Provincial General Hospital, No. 466, Xingang Road, Haizhu District, Guangzhou, 510317, China.
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Glinkowski WM, Narloch J. Bone Density at the Entry Point Correlates With the Trabecular Bone of the Thoracolumbar Vertebral Bodies - Quantitative Computed Tomography Study. J Clin Densitom 2019; 22:367-373. [PMID: 30482496 DOI: 10.1016/j.jocd.2018.11.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/22/2018] [Revised: 11/03/2018] [Accepted: 11/05/2018] [Indexed: 11/22/2022]
Abstract
PURPOSE To evaluate the relationship between cortical Bone Mineral Density (BMD) at pedicle entry points with trabecular BMD of the vertebral body in a spinal fracture. METHODS Quantitative computed tomography of the thoracolumbar spine was analyzed using dedicated software - QCT Pro (Mindways, Austin, TX). RESULTS Forty-six patients were evaluated. Among them 36 females were diagnosed with osteoporosis; the remaining 10 randomly selected from the database both males and females served as a control group. Overall measurements for 138 vertebrae were assessed. Cortical BMD of entry points for transpedicular screws was higher than trabecular vertebral BMD in osteoporotic (p < 0.001) and non-osteoporotic patients (p = 0.003). The difference was 3.6 times higher in low BMD cases (osteoporosis), compared to 2.3 times in normal subjects. Spearman's rank correlation coefficient showed the strongest correlation between patient's age and trabecular bone mineral density of L1 vertebral body (r = -0.94, p < 0.05), while cortical entry points were less correlated (r = -0.8, p < 0.05 and r = -0.65, p < 0.05 for left and right entry points, respectively). The strength of the correlations between BMD and age decreased gradually from L1 to L4, from r = -0.94 to r = -0.58 for the trabecular vertebral body; from r = -0.8 to r = -0.37 for entry points. Significant correlations were not found for BMD and the height or weight of the patients. CONCLUSIONS Cortical BMD at pedicle entry points decreases with osteoporosis. The relative contribution of cortical vs trabecular BMD increases with osteoporosis. Vertebral trabecular BMD is highly correlated with the cortical BMD of the entry points and allows predicting the bone support in fracture cases.
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Affiliation(s)
- Wojciech M Glinkowski
- Centre of Excellence "TeleOrto" for Telediagnostics and Treatment of Disorders and Injuries of the Locomotor System, Medical University of Warsaw, Warsaw, Poland; Department of Orthopaedics and Traumatology of the Locomotor System, Baby Jesus Clinical Hospital, Warsaw, Poland
| | - Jerzy Narloch
- Centre of Excellence "TeleOrto" for Telediagnostics and Treatment of Disorders and Injuries of the Locomotor System, Medical University of Warsaw, Warsaw, Poland; Chair and Department of Orthopaedics and Traumatology of the Locomotor System, Medical University of Warsaw, Warsaw Poland.
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The cement leakage in cement-augmented pedicle screw instrumentation in degenerative lumbosacral diseases: a retrospective analysis of 202 cases and 950 augmented pedicle screws. EUROPEAN SPINE JOURNAL : OFFICIAL PUBLICATION OF THE EUROPEAN SPINE SOCIETY, THE EUROPEAN SPINAL DEFORMITY SOCIETY, AND THE EUROPEAN SECTION OF THE CERVICAL SPINE RESEARCH SOCIETY 2019; 28:1661-1669. [PMID: 31030261 DOI: 10.1007/s00586-019-05985-4] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2018] [Revised: 03/12/2019] [Accepted: 04/19/2019] [Indexed: 12/14/2022]
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Rommens PM. Paradigm shift in geriatric fracture treatment. Eur J Trauma Emerg Surg 2019; 45:181-189. [PMID: 30725152 DOI: 10.1007/s00068-019-01080-x] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2018] [Accepted: 01/30/2019] [Indexed: 01/16/2023]
Abstract
The number of geriatric patients is increasing. These patients exhibit specific characteristics, which influence the type of fracture care. Many patients have comorbidities, which make them more vulnerable to surgical procedures. The soft tissue envelope around the fracture often is compromised due to pre-existing diseases such as diabetes, chronic venous insufficiency or peripheral vascular disease. Bone mineral density has decreased, which enhances the risk of implant loosening. The goals of treatment differ from those, which are valid for younger adults. Primary goal is preserving independency of the elderly patient in his activities of daily life. Advantages and drawbacks of surgical procedures have to be balanced with those of conservative treatment. Fractures of the lower extremities will more often need surgical treatment than fractures of the upper extremities. Patient´s autonomy is best obtained by creating high stability in the fracture plane, which enables motion and weight-bearing. Second priority is prevention of general and local post-operative complications by the use of less invasive surgical procedures. Restoring anatomy and optimal function are less important goals. The implants, which are used, are inserted through small incisions, placed deep under the skin and use long anatomic or osseous corridors. Intramedullary devices have important advantages. This paradigm shift takes the special challenges and requirements of geriatric patients into account.
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Affiliation(s)
- Pol Maria Rommens
- Department of Orthopaedics and Traumatology, University Medical Center of Johannes Gutenberg-University Mainz, Mainz, Germany.
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Easley J, Puttlitz CM, Seim H, Ramo N, Abjornson C, Cammisa FP, McGilvray KC. Biomechanical and histologic assessment of a novel screw retention technology in an ovine lumbar fusion model. Spine J 2018; 18:2302-2315. [PMID: 30075298 DOI: 10.1016/j.spinee.2018.07.021] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/08/2018] [Revised: 07/24/2018] [Accepted: 07/24/2018] [Indexed: 02/03/2023]
Abstract
BACKGROUND CONTEXT Screw loosening is a prevalent failure mode in orthopedic hardware, particularly in osteoporotic bone or revision procedures where the screw-bone engagement is limited. PURPOSE The objective of this study was to evaluate the efficacy of a novel screw retention technology (SRT) in an ovine lumbar fusion model. STUDY DESIGN/SETTING This was a biomechanical, radiographic, and histologic study utilizing an ovine lumbar spine model. METHODS In total, 54 (n=54) sheep lumbar spines (L2-L3) underwent posterior lumbar fusion (PLF) via pedicle screw fixation, connecting rod, and bone graft. Following three experimental variants were investigated: positive control (ideal clinical scenario), negative control (simulation of compromised screw holes), and SRT treatments. Biomechanical and histologic analyses of the functional spinal unit (FSU) were determined as a function of healing time (0, 3, and 12 months postoperative). RESULTS Screw pull-out, screw break-out, and FSU stability of the SRT treatments were generally equivalent to the positive control group and considerably better than the negative control group. Histomorphology of the SRT treatment screw region of interest (ROI) observed an increase in bone percentage and decrease in void space during healing, consistent with ingrowth at the implant interface. The PLF ROI observed similar bone percentage throughout healing between the SRT treatment and positive control. Less bone formation was observed for the negative control. CONCLUSIONS The results of this study demonstrate that the SRT improved screw retention and afforded effective FSU stabilization to achieve solid fusion in an otherwise compromised fixation scenario in a large animal model.
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Affiliation(s)
- Jeremiah Easley
- Preclinical Surgical Research Laboratory, Colorado State University, Fort Collins, CO, USA
| | - Christian M Puttlitz
- Orthopaedic Bioengineering Research Laboratory, Department of Mechanical Engineering, Colorado State University, 1374 Campus Delivery, Fort Collins, CO 80523-1374, USA
| | - Howard Seim
- Preclinical Surgical Research Laboratory, Colorado State University, Fort Collins, CO, USA
| | - Nicole Ramo
- Orthopaedic Bioengineering Research Laboratory, Department of Mechanical Engineering, Colorado State University, 1374 Campus Delivery, Fort Collins, CO 80523-1374, USA
| | - Celeste Abjornson
- Integrated Spine Research Program, Hospital for Special Surgery, New York, NY, USA
| | - Frank P Cammisa
- Department of Orthopedic Surgery, Hospital for Special Surgery, New York, NY, USA
| | - Kirk C McGilvray
- Orthopaedic Bioengineering Research Laboratory, Department of Mechanical Engineering, Colorado State University, 1374 Campus Delivery, Fort Collins, CO 80523-1374, USA.
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