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Pradeep K, Pal B, Mukherjee K, Shetty GM. Finite element analysis of implanted lumbar spine: Effects of open laminectomy plus PLF and open laminectomy plus TLIF surgical approaches on L3-L4 FSU. Med Eng Phys 2024; 128:104178. [PMID: 38789215 DOI: 10.1016/j.medengphy.2024.104178] [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: 08/28/2023] [Revised: 03/15/2024] [Accepted: 05/06/2024] [Indexed: 05/26/2024]
Abstract
Several finite element (FE) studies reported performances of various lumbar fusion surgical approaches. However, comparative studies on the performance of Open Laminectomy plus Posterolateral Fusion (OL-PLF) and Open Laminectomy plus Transforaminal Interbody Fusion (OL-TLIF) surgical approaches are rare. In the current FE study, the variation in ranges of motions (ROM), stress-strain distributions in an implanted functional spinal unit (FSU) and caudal adjacent soft structures between OL-PLF and OL-TLIF virtual models were investigated. The implanted lumbar spine FE models were developed from subject-specific computed tomography images of an intact spine and solved for physiological loadings such as compression, flexion, extension and lateral bending. Reductions in the ROMs of L1-L5 (49 % to 59 %) and L3-L4 implanted FSUs (91 % to 96 %) were observed for both models. Under all the loading cases, the maximum von Mises strain observed in the implanted segment of both models exceeds the mean compressive yield strain for the vertebra. The maximum von Mises stress and strain observed on the caudal adjacent soft structures of both the implanted models are at least 22 % higher than the natural spine model. The findings indicate the risk of failure in the implanted FSUs and higher chances of adjacent segment degeneration for both models.
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Affiliation(s)
- Kishore Pradeep
- Department of Mechanical Engineering, Indian Institute of Engineering Science and Technology (IIEST), Shibpur, Howrah 711103, West Bengal, India
| | - Bidyut Pal
- Department of Mechanical Engineering, Indian Institute of Engineering Science and Technology (IIEST), Shibpur, Howrah 711103, West Bengal, India.
| | - Kaushik Mukherjee
- Department of Mechanical Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110 016, India
| | - Gautam M Shetty
- QI Spine Clinic, Mumbai, India; Knee & Orthopaedic Clinic, Mumbai, India
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Wang Y, Maimaiti A, Xiao Y, Tuoheti A, Zhang R, Maitusong M, Chen Q, Rexiti P. Hybrid cortical bone trajectory and modified cortical bone trajectory techniques in transforaminal lumbar interbody fusion at L4-L5 segment: A finite element analysis. Heliyon 2024; 10:e26294. [PMID: 38434416 PMCID: PMC10906328 DOI: 10.1016/j.heliyon.2024.e26294] [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: 08/23/2023] [Revised: 02/03/2024] [Accepted: 02/09/2024] [Indexed: 03/05/2024] Open
Abstract
Background The academia has increasingly acknowledged the superior biomechanical performance of the hybrid fixation technique in recent years. However, there is a lack of research on the hybrid fixation technique using BCS (Bilateral Cortical Screws) and BMCS (Bilateral Modified Cortical Screws). This study aims to investigate the biomechanical performance of the BCS and BMCS hybrid fixation technique in transforaminal lumbar interbody fusion (TLIF) at the L4-L5 segment in a complete lumbar-sacral finite element model. Methods Three cadaver specimens are used to construct three lumbar-sacral finite element models. The biomechanical properties of various fixation technologies (BCS-BCS, BMCS-BMCS, BMCS-BCS, and BCS-BMCS) are evaluated at the L4-5 segment with a TLIF procedure conducted, including the range of motion (ROM) of the L4-5 segment, as well as the stress experienced by the cage, screws, and rods. The testing is conducted under specific loading conditions, including a compressive load of 400 N and a torque of 7.5Nm, subjecting the model to simulate flexion, extension, lateral bending, and rotation. Results No significant variations are seen in the ROM at the L4-5 segment when comparing the four fixation procedures during flexion and extension. However, when it comes to lateral bending and rotation, the ROM is ordered in descending order as BCS-BCS, BCS-BMCS, BMCS-BMCS, and BMCS-BCS. The maximum stress experienced by the cage is observed to be highest within the BMCS-BCS technique during movements including flexion, extension, and lateral bending. Conversely, the BMCS-BMCS technique exhibits the highest cage stress levels during rotational movements. The stress applies to the screws and rods order the sequence of BCS-BCS, BCS-BMCS, BMCS-BCS, and BMCS-BMCS throughout all four working conditions. Conclusion The BMCS-BCS technique shows better biomechanical performance with less ROM and lower stress on the internal fixation system compared to other fixation techniques. BMCS-BMCS technology has similar mechanical performance to BMCS-BCS but has more contact area between screws and cortical bone, making it better for patients with severe osteoporosis.
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Affiliation(s)
- Yixi Wang
- First Clinical Medical College, Xinjiang Medical University, Urumqi, China
- Department of Spine Surgery, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, China
| | - Abulikemu Maimaiti
- Department of Spine Surgery, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, China
| | - Yang Xiao
- Department of Spine Surgery, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, China
| | - Abudusalamu Tuoheti
- Department of Spine Surgery, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, China
| | - Rui Zhang
- Department of Spine Surgery, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, China
| | | | - Qihao Chen
- Department of Spine Surgery, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, China
| | - Paerhati Rexiti
- Department of Spine Surgery, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, China
- Key Laboratory of High Incidence Disease Research in Xinjiang (Xinjiang Medical University), Ministry of Education, Urumqi, China
- Xinjiang Clinical Research Center for Orthopedics, Urumqi, China
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Tuoheti A, Xiao Y, Wang Y, Maimaiti A, Zhang R, Kahaer A, Tuoheti A, Wu X, Rexiti P. Biomechanical evaluation of modified and traditional cortical bone trajectory technique on adjacent segment degeneration in transforaminal lumbar interbody fusion-finite element analysis. BMC Musculoskelet Disord 2024; 25:7. [PMID: 38166794 PMCID: PMC10759649 DOI: 10.1186/s12891-023-07103-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/19/2023] [Accepted: 12/07/2023] [Indexed: 01/05/2024] Open
Abstract
OBJECTIVES Modified cortical bone trajectory (MCBT) technique was proposed by our team in previous studies, but its biomechanical properties at adjacent segments have not been discussed yet. Therefore, the purpose of this study is to investigate the biomechanical properties of modified cortical bone trajectory (MCBT) technique on adjacent segment degeneration (ASD) in transforaminal intradiscal lumbar disc fusion (TLIF) compare to traditional bone trajectory (TT) technique and cortical bone trajectory (CBT) technique. METHODS The four human cadaveric lumbar specimens were provided by the anatomy teaching and research department of Xinjiang Medical University and four intact finite element models of the L1-S1 segment were generated. For each of these, three transforaminal lumbar interbody fusion procedures with three different fixation techniques were reconstructed at the L4-L5 segment, as follows: TT-TT (TT at both L4 and L5 segments), CBT-CBT (CBT at both L4 and L5 segments), MCBT-MCBT (MCBT at both L4 and L5 segments). The range of motion and von Mises stress of the intervertebral disc of the L3-L4 and L5-S1 segments were recorded with a 400N compressive load and 7.5 Nm moments in flexion, extension, left-right bending, and left-right rotation. RESULTS The peak ROM of the L3-L4 segment in the MCBT-MCBT group was reduced by 10.5%, 6.1%, 12.2%, 4.1%, and 1.5% in flexion, extension, left-right bending, and left rotation compared to the TT-TT group and reduced by 1.8%, 5.5%, 10.0%, 12.8%, and 8.8% in flexion, left-right bending, and left-right rotation compared to the CBT-CBT group, respectively. The MCBT-MCBT group has the lowest peak ROM of the L3-L4 segment in flexion, left bending, and right rotation, the lowest peak ROM of the L5-S1 segment in extension and right rotation, and the lowest peak von Mises stress of the intervertebral disc at the L5-S1 segment in right rotation compared to the TT-TT and CBT-CBT group. In addition, the peak von Mises stress at the L3-L4 segment was lowest and more dispersed in all motions, the MCBT-MCBT group exhibited lower peak ROM of the L5-S1 segment in flexion, extension, and right rotation, and showed lower peak von Mises stress of the disc at the L5-S1 segment in flexion, extension, and right rotation compared with the TT-TT group. CONCLUSION The modified cortical bone trajectory technique may have a beneficial effect on reducing the incidence of ASD in the L4-L5 TLIF model compared to the traditional bone trajectory technique and cortical bone trajectory technique.
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Affiliation(s)
- Abudusalamu Tuoheti
- Department of Spine Surgery, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, China
| | - Yang Xiao
- Department of Spine Surgery, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, China
| | - Yixi Wang
- Xinjiang Medical University, Urumqi, China
| | - Abulikemu Maimaiti
- Department of Spine Surgery, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, China
| | - Rui Zhang
- Department of Spine Surgery, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, China
| | - Alafate Kahaer
- Department of Spine Surgery, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, China
| | | | - Xianghui Wu
- Department of Spine Surgery, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, China
| | - Paerhati Rexiti
- Department of Spine Surgery, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, China.
- Ministrv of Education, Key Laboratory of High Incidence Disease Research in Xingjiang (Xinjiang Medical University), Urumqi, China.
- Xinjiang Clinical Research Center for Orthopedics, Urumqi, China.
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Pradeep K, Pal B. Effects of open and minimally invasive Transforaminal Lumbar Interbody Fusion (TLIF) surgical techniques on mechanical behaviour of fused L3-L4 FSU: A comparative finite element study. Med Eng Phys 2024; 123:104084. [PMID: 38365336 DOI: 10.1016/j.medengphy.2023.104084] [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: 08/24/2023] [Revised: 11/30/2023] [Accepted: 12/10/2023] [Indexed: 02/18/2024]
Abstract
For predicting the biomechanical effects of the fusion procedure, finite element (FE) analysis is widely used as a preclinical tool. Although several FE studies examined the efficacies of various fusion surgical techniques, comparative studies on Open and minimally invasive (MIS) transforaminal lumbar interbody fusion (TLIF) procedures incorporating a follower coordinate system have not been investigated yet. The current FE study evaluates the ranges of motion (ROM) and load distributions of Open-TLIF and MIS-TLIF implanted models, under physiological loading such as compression, flexion, extension and lateral bending. The most noteworthy finding from the investigation is that both the fusion procedures significantly reduced the ROMs of the implanted segment (L3-L4) and full model (L1-L5) by at least 89 % and 44 %, respectively, compared to the intact model. For all loading situations, over 95 % of the implanted models' cancellous bone volume was subjected to von Mises strains ranging from 0.0003 to 0.005. The maximum von Mises strain was observed to be localized on a small amount of cancellous bone volume (<5 %). The likelihood of adjacent segment degeneration is higher in the case of MIS-TLIF due to the higher stress (22-53 MPa) and strain (0.018-0.087) noticed on the upper facet of the L3 vertebra.
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Affiliation(s)
- Kishore Pradeep
- Department of Mechanical Engineering, Indian Institute of Engineering Science and Technology (IIEST), Shibpur, Howrah 711103, West Bengal, India
| | - Bidyut Pal
- Department of Mechanical Engineering, Indian Institute of Engineering Science and Technology (IIEST), Shibpur, Howrah 711103, West Bengal, India.
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Zhang S, Zhang Y, Huang L, Zhang S, Lu C, Liu Z, Kang C, Wang Z. Oblique lateral interbody fusion with internal fixations in the treatment for cross-segment degenerative lumbar spine disease (L2-3 and L4-5) finite element analysis. Sci Rep 2023; 13:17116. [PMID: 37816744 PMCID: PMC10564781 DOI: 10.1038/s41598-023-43399-x] [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: 12/04/2022] [Accepted: 09/22/2023] [Indexed: 10/12/2023] Open
Abstract
Multi-segmental lumbar degenerative disease, including intersegmental disc degeneration, is found in clinical practice. Controversy still exists regarding the treatment for cross-segment degeneration. Oblique Lateral Interbody Fusion (OLIF) with several internal fixations was used to treat cross-segment lumbar degenerative disease. A whole lumbar spine model was extracted from CT images of the whole lumbar spine of patients with lumbar degeneration. The L2-3 and L4-5 intervertebral spaces were fused with OLIF using modeling software, the Pedicle screws were performed on L2-3 and L4-5, and different internal fixations were performed on L3-4 in Finite Element (FE) software. Among the six 10 Nm moments of different directions, the L3-4 no surgery (NS) group had the relatively largest Range of Motion (ROM) in the whole lumbar spine, while the L2-5 Long segmental fixation (LSF)group had the smallest ROM and the other groups had similar ROM. The ROM in the L1-2 and L5-S1 was relatively close in the six group models, and the articular cartilage stress and disc stress on the L1-2 and L5-S1 were relatively close. In contrast, the L3-4 ROM differed relatively greatly, with the LSF ROM the smallest and the NS ROM the largest, and the L3-4 Coflex (Coflex) group more active than the L3-4 Bacfuse (Bacfuse) group and the L3-4 translaminar facet screw fixation (TFSF) group. The stress on the articular cartilage and disc at L3-4 was relatively greater in the NS disc and articular cartilage, and greater in the Coflex group than in the Bacfuse and TFSF groups, with the greatest stress on the internal fixation in the TFSF group, followed by the Coflex group, and relatively similar stress in the Bacfuse, LSF, and NS groups. In the TFSF group, the stress on the internal fixation was greater than the yield strength among different directional moments of 10 Nm, which means it is unsuitable to be an internal fixation. The LSF group had the greatest overall ROM, which may lead to postoperative low back discomfort. The NS group has the greatest overall ROM, but its increased stress on the L3-4 disc and articular cartilage may lead to accelerated degeneration of the L3-4 disc and articular cartilage. The Coflex and Bacfuse groups had a reduced L3-4 ROM but a greater stress on disc compared to the LSF group, which may lead to disc degeneration in the long term. However, their stress on the articular cartilage was relatively low. Coflex and Bacfuse can still be considered better surgical options.
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Affiliation(s)
- Shuyi Zhang
- Department of Orthopedics, Fuzhou Second Hospital, Fuzhou, 350007, Fujian, China
- Department of Spine Surgery, Affiliated Hospital of Chengde Medical College, Chengde, 067000, Hebei, China
| | - Yilong Zhang
- Department of Spine Surgery, Affiliated Hospital of Chengde Medical College, Chengde, 067000, Hebei, China
| | - Licai Huang
- Department of Orthopedics, Fuzhou Second Hospital, Fuzhou, 350007, Fujian, China
| | - Shuao Zhang
- School of Civil Engineering, Lanzhou University of Technology, Lanzhou, 730000, Gansu, China
| | - Chenshui Lu
- Department of Foreign Languages, Fu Zhou University, Fuzhou, 350100, Fujian, China
| | - Zhengpeng Liu
- Department of Spine Surgery, Affiliated Hospital of Chengde Medical College, Chengde, 067000, Hebei, China
| | - Chan Kang
- Department of Orthopedics, Chungnam National University Hospital, Daejeon, 35015, Republic of Korea
| | - Zhao Wang
- Department of Orthopedics, Chungnam National University Hospital, Daejeon, 35015, Republic of Korea.
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Pao JL. Biportal Endoscopic Transforaminal Lumbar Interbody Fusion Using Double Cages: Surgical Techniques and Treatment Outcomes. Neurospine 2023; 20:80-91. [PMID: 37016856 PMCID: PMC10080423 DOI: 10.14245/ns.2346036.018] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2023] [Accepted: 03/03/2023] [Indexed: 04/03/2023] Open
Abstract
Objective: To describe the surgical techniques and the treatment outcomes of biportal endoscopic transforaminal lumbar interbody fusion (BETLIF) using double cages.Methods: This study included 89 patients with 114 fusion segments between July 2019 and May 2021. One pure polyetheretherketone (PEEK) cage and 1 composite titanium-PEEK cage were used for interbody fusion. Clinical outcomes measures included visual analogue scale (VAS) scores for lower back pain and leg pain, Oswestry Disability Index (ODI), and Japanese Orthopedic Association (JOA) scores. Computed tomography (CT) of the lumbar spine 1 year postoperatively was used to evaluate the Bridwell interbody fusion grades.Results: There were significant improvement in VAS for lower back pain from 5.2 ± 3.1 to 1.7 ± 2.1, VAS for leg pain from 6.3 ± 2.5 to 1.7 ± 2.0, ODI from 46.7 ± 17.0 to 12.7 ± 16.1, and JOA score from 15.6 ± 6.3 to 26.4 ± 3.2. The p-values were all < 0.001. The average hospital stay was 5.7 ± 1.1 days. The CT studies available for 60 fusion segments showed successful fusion (Bridwell grade I or grade II) in 56 segments (93.3%). Significant cage subsidence of more than 2 mm was only noted in 3 segments (5.0%). Complications included 1 dural tear, 2 pedicle screws malposition, and 2 epidural hematomas, in which 2 patients required reoperations.Conclusion: BETLIF with double cages provided good neural decompression and a sound environment for interbody fusion with a big cage footprint, a large amount of bone graft, endplate preservation, and segmental stability.
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Affiliation(s)
- Jwo-Luen Pao
- Department of Orthopedic Surgery, Far-Eastern Memorial Hospital, New Taipei City, Taiwan
- Longhwa University of Science and Technology, Taoyuan, Taiwan
- Corresponding Author Jwo-Luen Pao Department of Orthopedic Surgery, Far-Eastern Memorial Hospital, 21, Section 2, Nanya South Road, Banqiao District, New Taipei 22060, Taiwan
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Biomechanical and clinical studies on lumbar spine fusion surgery: a review. Med Biol Eng Comput 2023; 61:617-634. [PMID: 36598676 DOI: 10.1007/s11517-022-02750-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Accepted: 12/22/2022] [Indexed: 01/05/2023]
Abstract
Low back pain is associated with degenerative disc diseases of the spine. Surgical treatment includes fusion and non-fusion types. The gold standard is fusion surgery, wherein the affected vertebral segment is fused. The common complication of fusion surgery is adjacent segment degeneration (ASD). The ASD often leads to revision surgery, calling for a further fusion of adjacent segments. The existing designs of nonfusion type implants are associated with clinical problems such as subsidence, difficulty in implantation, and the requirement of revision surgeries. Various surgical approaches have been adopted by the surgeons to insert the spinal implants into the affected segment. Over the years, extensive biomechanical investigations have been reported on various surgical approaches and prostheses to predict the outcomes of lumbar spine implantations. Computer models have been proven to be very effective in identifying the best prosthesis and surgical procedure. The objective of the study was to review the literature on biomechanical studies for the treatment of lumbar spinal degenerative diseases. A critical review of the clinical and biomechanical studies on fusion spine surgeries was undertaken. The important modeling parameters, challenges, and limitations of the current studies were identified, showing the future research directions.
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Pei B, Xu Y, Zhao Y, Wu X, Lu D, Wang H, Wu S. Biomechanical comparative analysis of conventional pedicle screws and cortical bone trajectory fixation in the lumbar spine: An in vitro and finite element study. Front Bioeng Biotechnol 2023; 11:1060059. [PMID: 36741751 PMCID: PMC9892841 DOI: 10.3389/fbioe.2023.1060059] [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: 10/04/2022] [Accepted: 01/09/2023] [Indexed: 01/21/2023] Open
Abstract
Numerous screw fixation systems have evolved in clinical practice as a result of advances in screw insertion technology. Currently, pedicle screw (PS) fixation technology is recognized as the gold standard of posterior lumbar fusion, but it can also have some negative complications, such as screw loosening, pullout, and breakage. To address these concerns, cortical bone trajectory (CBT) has been proposed and gradually developed. However, it is still unclear whether cortical bone trajectory can achieve similar mechanical stability to pedicle screw and whether the combination of pedicle screw + cortical bone trajectory fixation can provide a suitable mechanical environment in the intervertebral space. The present study aimed to investigate the biomechanical responses of the lumbar spine with pedicle screw and cortical bone trajectory fixation. Accordingly, finite element analysis (FEA) and in vitro specimen biomechanical experiment (IVE) were performed to analyze the stiffness, range of motion (ROM), and stress distribution of the lumbar spine with various combinations of pedicle screw and cortical bone trajectory screws under single-segment and dual-segment fixation. The results show that dual-segment fixation and hybrid screw placement can provide greater stiffness, which is beneficial for maintaining the biomechanical stability of the spine. Meanwhile, each segment's range of motion is reduced after fusion, and the loss of adjacent segments' range of motion is more obvious with longer fusion segments, thereby leading to adjacent-segment disease (ASD). Long-segment internal fixation can equalize total spinal stresses. Additionally, cortical bone trajectory screws perform better in terms of the rotation resistance of fusion segments, while pedicle screw screws perform better in terms of flexion-extension resistance, as well as lateral bending. Moreover, the maximum screw stress of L4 cortical bone trajectory/L5 pedicle screw is the highest, followed by L45 cortical bone trajectory. This biomechanical analysis can accordingly provide inspiration for the choice of intervertebral fusion strategy.
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Affiliation(s)
- Baoqing Pei
- Beijing key laboratory for design and evaluation technology of advanced implantable & interventional medical devices, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Yangyang Xu
- Beijing key laboratory for design and evaluation technology of advanced implantable & interventional medical devices, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Yafei Zhao
- Aerospace center hospital, Beijing, China
| | - Xueqing Wu
- Beijing key laboratory for design and evaluation technology of advanced implantable & interventional medical devices, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, China,*Correspondence: Xueqing Wu, ; Shuqin Wu,
| | - Da Lu
- Beijing key laboratory for design and evaluation technology of advanced implantable & interventional medical devices, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Haiyan Wang
- School of Basic Medicine, Inner Mongolia Medical University, Hohhot, China
| | - Shuqin Wu
- School of Big Data and Information, Shanxi College of Technology, Shanxi, China,*Correspondence: Xueqing Wu, ; Shuqin Wu,
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Han Z, Ma C, Li B, Ren B, Liu J, Huang Y, Qiao L, Mao K. Biomechanical studies of different numbers and positions of cage implantation on minimally invasive transforaminal interbody fusion: A finite element analysis. Front Surg 2022; 9:1011808. [PMID: 36420402 PMCID: PMC9676234 DOI: 10.3389/fsurg.2022.1011808] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2022] [Accepted: 09/08/2022] [Indexed: 01/29/2024] Open
Abstract
BACKGROUND The position and number of cages in minimally invasive transforaminal interbody fusion (MIS-TLIF) are mainly determined by surgeons based on their individual experience. Therefore, it is important to investigate the optimal number and position of cages in MIS-TLIF. METHODS The lumbar model was created based on a 24-year-old volunteer's computed tomography data and then tested using three different cage implantation methods: single transverse cage implantation (model A), single oblique 45° cage implantation (model B), and double vertical cage implantation (model C). A preload of 500 N and a moment of 10 Nm were applied to the models to simulate lumbar motion, and the models' range of motion (ROM), ROM ratio, peak stress of the internal fixation system, and cage were assessed. RESULTS The ROM ratios of models A, B, and C were significantly reduced by >71% compared with the intact model under all motions. Although there were subtle differences in the ROM ratio for models A, B, and C, the trends were similar. The peak stress of the internal fixation system appeared in model B of 136.05 MPa (right lateral bending), which was 2.07 times that of model A and 1.62 times that of model C under the same condition. Model C had the lowest cage stress, which was superior to that of the single-cage model. CONCLUSION In MIS-TLIF, single long-cage transversal implantation is a promising standard implantation method, and double short-cage implantation is recommended for patients with severe osteoporosis.
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Affiliation(s)
- Zhenchuan Han
- Department of Orthopedics, Chinese PLA General Hospital, Beijing, China
- Department of Orthopedics, PLA Rocket Force Characteristic Medical Center, Beijing, China
| | - Chao Ma
- Key Laboratory of Modern Measurement and Control Technology, Ministry of Education, Beijing Information Science and Technology University, Beijing, China
| | - Bo Li
- Department of Orthopedics, Weihai Municipal Third Hospital, Weihai, China
| | - Bowen Ren
- Department of Orthopedics, Chinese PLA General Hospital, Beijing, China
| | - Jianheng Liu
- Department of Orthopedics, Chinese PLA General Hospital, Beijing, China
| | - Yifei Huang
- Department of Orthopedics, The Fourth Affiliated Hospital of Xinjiang Medical University, Urumqi, China
| | - Lin Qiao
- Department of Orthopedics, PLA Rocket Force Characteristic Medical Center, Beijing, China
| | - Keya Mao
- Department of Orthopedics, Chinese PLA General Hospital, Beijing, China
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Wu MH, Lee MH, Wu C, Tsai PI, Hsu WB, Huang SI, Lin TH, Yang KY, Chen CY, Chen SH, Lee CY, Huang TJ, Tsau FH, Li YY. In Vitro and In Vivo Comparison of Bone Growth Characteristics in Additive-Manufactured Porous Titanium, Nonporous Titanium, and Porous Tantalum Interbody Cages. MATERIALS 2022; 15:ma15103670. [PMID: 35629694 PMCID: PMC9147460 DOI: 10.3390/ma15103670] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/24/2022] [Revised: 05/04/2022] [Accepted: 05/17/2022] [Indexed: 02/06/2023]
Abstract
Autogenous bone grafts are the gold standard for interbody fusion implant materials; however, they have several disadvantages. Tantalum (Ta) and titanium (Ti) are ideal materials for interbody cages because of their biocompatibility, particularly when they are incorporated into a three-dimensional (3D) porous structure. We conducted an in vitro investigation of the cell attachment and osteogenic markers of self-fabricated uniform porous Ti (20%, 40%, 60%, and 80%), nonporous Ti, and porous Ta cages (n = 6) in each group. Cell attachment, osteogenic markers, and alkaline phosphatase (ALP) were measured. An in vivo study was performed using a pig-posterior-instrumented anterior interbody fusion model to compare the porous Ti (60%), nonporous Ti, and porous Ta interbody cages in 12 pigs. Implant migration and subsidence, determined using plain radiographs, were recorded before surgery, immediately after surgery, and at 1, 3, and 6 months after surgery. Harvested implants were assessed for bone ingrowth and attachment. Relative to the 20% and 40% porous Ti cages, the 60% and 80% cages achieved superior cellular migration into cage pores. Among the cages, osteogenic marker and ALP activity levels were the highest in the 60% porous Ti cage, osteocalcin expression was the highest in the nonporous Ti cage, and the 60% porous Ti cage exhibited the lowest subsidence. In conclusion, the designed porous Ti cage is biocompatible and suitable for lumbar interbody fusion surgery and exhibits faster fusion with less subsidence compared with porous Ta and nonporous Ti cages.
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Affiliation(s)
- Meng-Huang Wu
- Department of Orthopaedics, School of Medicine, College of Medicine, Taipei Medical University, Taipei 110301, Taiwan; (M.-H.W.); (C.-Y.C.); (C.-Y.L.); (T.-J.H.)
- Department of Orthopedics, Taipei Medical University Hospital, Taipei 110301, Taiwan
- TMU Biodesign Center, Taipei Medical University, Taipei 110301, Taiwan
| | - Ming-Hsueh Lee
- Neurosurgery, Department of Surgery, Chang Gung Memorial Hospital, Chiayi 613016, Taiwan;
- Department of Nursing, Chang Gung University of Science and Technology, Chiayi 613016, Taiwan
| | - Christopher Wu
- College of Medicine, Taipei Medical University, Taipei 110301, Taiwan;
| | - Pei-I Tsai
- Biomedical Technology and Device Research Laboratories, Industrial Technology Research Institute, Chutung, Hsinchu County 310401, Taiwan; (P.-I.T.); (S.-I.H.); (K.-Y.Y.)
| | - Wei-Bin Hsu
- Sports Medicine Center, Chang Gung Memorial Hospital, Chiayi 613016, Taiwan;
| | - Shin-I Huang
- Biomedical Technology and Device Research Laboratories, Industrial Technology Research Institute, Chutung, Hsinchu County 310401, Taiwan; (P.-I.T.); (S.-I.H.); (K.-Y.Y.)
| | - Tzu-Hung Lin
- Material and Chemical Research Laboratories, Industrial Technology Research Institute, Chutung, Hsinchu County 310401, Taiwan;
| | - Kuo-Yi Yang
- Biomedical Technology and Device Research Laboratories, Industrial Technology Research Institute, Chutung, Hsinchu County 310401, Taiwan; (P.-I.T.); (S.-I.H.); (K.-Y.Y.)
| | - Chih-Yu Chen
- Department of Orthopaedics, School of Medicine, College of Medicine, Taipei Medical University, Taipei 110301, Taiwan; (M.-H.W.); (C.-Y.C.); (C.-Y.L.); (T.-J.H.)
- TMU Biodesign Center, Taipei Medical University, Taipei 110301, Taiwan
- Department of Orthopedics, Shuang-Ho Hospital, Taipei Medical University, Taipei 235041, Taiwan
| | - Shih-Hao Chen
- Department of Orthopedic Surgery, Buddhist Tzu-Chi General Hospital, Taichung Branch, Taichung 427213, Taiwan;
- Department of Orthopedic Surgery, Tzu-Chi University, Hualien 970374, Taiwan
| | - Ching-Yu Lee
- Department of Orthopaedics, School of Medicine, College of Medicine, Taipei Medical University, Taipei 110301, Taiwan; (M.-H.W.); (C.-Y.C.); (C.-Y.L.); (T.-J.H.)
- Department of Orthopedics, Taipei Medical University Hospital, Taipei 110301, Taiwan
| | - Tsung-Jen Huang
- Department of Orthopaedics, School of Medicine, College of Medicine, Taipei Medical University, Taipei 110301, Taiwan; (M.-H.W.); (C.-Y.C.); (C.-Y.L.); (T.-J.H.)
- Department of Orthopedics, Taipei Medical University Hospital, Taipei 110301, Taiwan
| | - Fang-Hei Tsau
- Laser and Additive Manufacturing Technology Center, Southern Region Campus, Industrial Technology Research Institute, Tainan 734045, Taiwan;
| | - Yen-Yao Li
- Department of Orthopaedic Surgery, Chang Gung Memorial Hospital, Chiayi 613016, Taiwan
- College of Medicine, Chang Gung University, Taoyuan 333323, Taiwan
- Correspondence: ; Tel.: +88653621000 (ext. 2855)
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11
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Guo HZ, Guo DQ, Tang YC, Liang D, Zhang SC. Selective cement augmentation of cranial and caudal pedicle screws provides comparable stability to augmentation on all segments in the osteoporotic spine: a finite element analysis. ANNALS OF TRANSLATIONAL MEDICINE 2020; 8:1384. [PMID: 33313129 PMCID: PMC7723578 DOI: 10.21037/atm-20-2246] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Background Cement-augmented pedicle screw instrumentation (CAPSI) has been proven to significantly increase the biomechanical stability in the osteoporotic lumbar spine. However, besides the merits, it is responsible for the inevitable cement leakage growing with more instrumented segments and volumes involved. This study aimed to compare the biomechanical performance of pedicle screws augmented on all segments with those augmented only on the cranial and caudal vertebrae selectively. Methods The finite element model of L3-S1 was modeled with the CT data of a healthy volunteer, the solid/fenestrated pedicle screws from micro-CT scans of physical screws, and bone cement from the CT scans of a postoperative patient with CAPSI. Three different augmented strategies for pedicle screws were taken into consideration: augmentation at each pedicle trajectory (Model A), selective augmentation at the cranial and caudal pedicle trajectories (Model B), and pedicle trajectories without augmentation (Model C). A total of six surgical models were constructed: Models A, B, and C were subdivided into double segmental fusion from L4 to S1 (Models A1, B1, and C1) and multi-segment fusion from L3 to S1 (Models A2, B2, and C2). The Range of motion (ROM), stress on the cage, and stress on the fixed segments were compared among the six models. Results The ROM at the fusion segments decreased in all instrumentation models. The ROMs of Model B and Model A are similar in each direction, while that of Model C is significantly larger. The differences in the ROMs between Model A and Model B were noted to be less than 0.1°. Compared with Models A1 and A2, the peak Von Mise stress on the cage-endplate interface and pedicle screws were slightly higher in Models B1 and B2. In contrast, the stress of Models C1 and C2 increased significantly. The compressive stress was concentrated in the screw head, the cranial and caudal screws, and rods. Conclusions The selective augmentation of pedicle screws is capable of providing reliable stability in short-segment posterior fixation (2- or 3-level). It could be a potential optimal procedure to minimize the associated complications of CAPSI.
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Affiliation(s)
- Hui-Zhi Guo
- The First Institute of Clinical Medicine, Guangzhou University of Chinese Medicine, Guangzhou, China.,Spine Surgery Department, The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Dan-Qing Guo
- The First Institute of Clinical Medicine, Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Yong-Chao Tang
- Spine Surgery Department, The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, China
| | - De Liang
- Spine Surgery Department, The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Shun-Cong Zhang
- The First Institute of Clinical Medicine, Guangzhou University of Chinese Medicine, Guangzhou, China.,Spine Surgery Department, The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, China
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12
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Wang QD, Guo LX. Comparison of dynamic response of three TLIF techniques on the fused and adjacent segments under vibration. Comput Methods Biomech Biomed Engin 2020; 24:308-319. [PMID: 33047970 DOI: 10.1080/10255842.2020.1829604] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
To explore which TLIF techniques are advantageous in reducing the risk of complications and conducive to bone fusion under the vibration. The L1-L5 finite element lumbar model was modified to simulate three different TLIF techniques (a unilateral standard cage, a crescent-shaped cage, and bilateral standard cages). The results showed that the crescent-shaped cage may reduce the risk of subsidence and provide a more stable and suitable environment for vertebral cell growth under the vibration compared to the other TLIF techniques. Unilateral cage may increase the risk of adjacent segment disease and cage failure including fatigue failure under vibration.
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Affiliation(s)
- Qing-Dong Wang
- School of Mechanical Engineering and Automation, Northeastern University, Shenyang, China
| | - Li-Xin Guo
- School of Mechanical Engineering and Automation, Northeastern University, Shenyang, China
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13
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Guo HZ, Zhang SC, Guo DQ, Ma YH, Yuan K, Li YX, Peng JC, Li JL, Liang D, Tang YC. Influence of cement-augmented pedicle screws with different volumes of polymethylmethacrylate in osteoporotic lumbar vertebrae over the adjacent segments: a 3D finite element analysis. BMC Musculoskelet Disord 2020; 21:460. [PMID: 32660462 PMCID: PMC7359596 DOI: 10.1186/s12891-020-03498-6] [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: 01/31/2020] [Accepted: 07/10/2020] [Indexed: 11/10/2022] Open
Abstract
Background Polymethylmethacrylate (PMMA) is commonly used for cement-augmented pedicle screw instrumentation (CAPSI) to improve the fixation stability and reduce the risk of screw loosening in the osteoporotic thoracolumbar spine. Biomechanical researches have shown that various dose of cement (1-3 ml) can be injected to enhance screw stability. To date, there have been no studies on the relationship between adjacent segment degeneration and the volume of PMMA. This study aimed to explore the influence of CAPSI with different volumes of PMMA in osteoporotic lumbar vertebrae over adjacent segments by using finite element analysis. Methods Seven different finite element models were reconstructed and simulated under different loading conditions, including (1) an intact model, (2) three single-level CAPSI models with different volumes of PMMA (1, 1.73, and 2.5 ml), and (3) three double-level CAPSI models with different volumes of PMMA (1, 1.73, and 2.5 ml). To improve the accuracy of the finite element analysis, the models of the injectable pedicle screw and bone cement were created by using a three-dimensional scanning machine and the CAPSI patient’s CT data, respectively. The range of motion (ROM), the stress of intervertebral discs, and the stress of facet in the adjacent segment were comparatively analyzed among the different models. Results The ROMs of the different segments were compared with experimental data, with good agreement under the different load conditions (21.3°, 13.55°, 13.99°, and 6.11° in flexion, extension, bending, and rotation at L3-S1 level, respectively). Compared with the intact model, the ROM, disc stresses, and facet stress in adjacent segments were found to be higher in the six operative models. Otherwise, with a larger volume of PMMA injected, the ROM, disc stresses, and facet stress slightly increased at the adjacent segment. However, the differences were insignificant with the biggest difference less than 3.8%. Conclusions CAPSI could increase the incidence of disk degeneration in the adjacent segment, while within a certain range, different volumes of PMMA provided an approximate impact over the adjacent segment degeneration.
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Affiliation(s)
- Hui-Zhi Guo
- The 1st Institute of Clinical Medicine, Guangzhou University of Chinese Medicine, 12 Airport Road, Baiyun District, Guangzhou, 510407, Guangdong, People's Republic of China.,Spine Surgery Department, The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, 510407, China
| | - Shun-Cong Zhang
- The 1st Institute of Clinical Medicine, Guangzhou University of Chinese Medicine, 12 Airport Road, Baiyun District, Guangzhou, 510407, Guangdong, People's Republic of China.,Spine Surgery Department, The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, 510407, China
| | - Dan-Qing Guo
- The 1st Institute of Clinical Medicine, Guangzhou University of Chinese Medicine, 12 Airport Road, Baiyun District, Guangzhou, 510407, Guangdong, People's Republic of China
| | - Yan-Huai Ma
- The 1st Institute of Clinical Medicine, Guangzhou University of Chinese Medicine, 12 Airport Road, Baiyun District, Guangzhou, 510407, Guangdong, People's Republic of China.,Spine Surgery Department, The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, 510407, China
| | - Kai Yuan
- Spine Surgery Department, The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, 510407, China
| | - Yong-Xian Li
- The 1st Institute of Clinical Medicine, Guangzhou University of Chinese Medicine, 12 Airport Road, Baiyun District, Guangzhou, 510407, Guangdong, People's Republic of China.,Spine Surgery Department, The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, 510407, China
| | - Jian-Cheng Peng
- The 1st Institute of Clinical Medicine, Guangzhou University of Chinese Medicine, 12 Airport Road, Baiyun District, Guangzhou, 510407, Guangdong, People's Republic of China.,Spine Surgery Department, The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, 510407, China
| | - Jing-Lan Li
- The 1st Institute of Clinical Medicine, Guangzhou University of Chinese Medicine, 12 Airport Road, Baiyun District, Guangzhou, 510407, Guangdong, People's Republic of China
| | - De Liang
- Spine Surgery Department, The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, 510407, China
| | - Yong-Chao Tang
- Spine Surgery Department, The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, 510407, China.
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14
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Zhou QK, Zeng FH, Tu JL, Dong ZQ, Ding ZH. Influence of cement-augmented pedicle screw instrumentation in an osteoporotic lumbosacral spine over the adjacent segments: a 3D finite element study. J Orthop Surg Res 2020; 15:132. [PMID: 32264901 PMCID: PMC7137326 DOI: 10.1186/s13018-020-01650-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/07/2019] [Accepted: 03/27/2020] [Indexed: 02/06/2023] Open
Abstract
Abstract Purpose To compare the effect of conventional pedicle screw (CPS) and cement-augmented pedicle screw instrumentation (CAPSI) on adjacent segment degeneration (ASD). Methods A normal male volunteer without a history of spinal disease was selected, lumbar CT data was collected, an intact L3-S1 three-dimensional finite element model was created by software including Mimics, Geomagic, and SolidWorks, and the fixation methods were performed accordingly. A common pedicle screw model and a cement-augmented pedicle screw model of L4–L5 with fusion and internal fixation were constructed. With ANSYS Workbench 17.0, a 500 N load was applied to the upper surface of L3 to simulate the weight of a human body, and a 7.5 N m moment was applied at the neutral point to simulate flexion, extension, left/right bending, left/right rotation of the spine. The peak von Mises stress of intervertebral disc and the range of motion (ROM) on the adjacent segments (L3–4 and L5–S1) were compared. Results The validity of the intact model shows that the ROM of the model is similar to that of a cadaveric study. Compared with the intact model, CPS model and CAPSI model in all motion patterns increased the ROM of adjacent segments. The intervertebral disc stress and the ROM of adjacent segments were found to be higher in the CAPSI model than in the CPS model, especially in L3–4. Conclusion In general, the biomechanical analysis of an osteoporotic lumbar spine showed that both CPS and CAPSI can increase the ROM and disc stresses of osteoporotic lumbar models, and compared with CPS, CAPSI is more likely to increase the potential risk of adjacent segment degeneration.
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Affiliation(s)
- Quan-Kun Zhou
- Nanchang Hongdu Hospital of Traditional Chinese Medicine, 264 Minde Road, Donghu District, Nanchang, 330006, Jiangxi, People's Republic of China
| | - Fan-Hui Zeng
- Nanchang Hongdu Hospital of Traditional Chinese Medicine, 264 Minde Road, Donghu District, Nanchang, 330006, Jiangxi, People's Republic of China.
| | - Jian-Long Tu
- Nanchang Hongdu Hospital of Traditional Chinese Medicine, 264 Minde Road, Donghu District, Nanchang, 330006, Jiangxi, People's Republic of China
| | - Zhang-Qing Dong
- Nanchang Hongdu Hospital of Traditional Chinese Medicine, 264 Minde Road, Donghu District, Nanchang, 330006, Jiangxi, People's Republic of China
| | - Zhi-Hui Ding
- Nanchang Hongdu Hospital of Traditional Chinese Medicine, 264 Minde Road, Donghu District, Nanchang, 330006, Jiangxi, People's Republic of China
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15
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Liang Z, Cui J, Zhang J, He J, Tang J, Ren H, Ye L, Liang D, Jiang X. Biomechanical evaluation of strategies for adjacent segment disease after lateral lumbar interbody fusion: is the extension of pedicle screws necessary? BMC Musculoskelet Disord 2020; 21:117. [PMID: 32085708 PMCID: PMC7035718 DOI: 10.1186/s12891-020-3103-1] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/16/2019] [Accepted: 01/30/2020] [Indexed: 12/26/2022] Open
Abstract
Background Adjacent segment disease (ASD) is a well-known complication after interbody fusion. Pedicle screw-rod revision possesses sufficient strength and rigidity. However, is a surgical segment with rigid fixation necessary for ASD reoperation? This study aimed to investigate the biomechanical effect of different instrumentation on lateral lumbar interbody fusion (LLIF) for ASD treatment. Methods A validated L2~5 finite element (FE) model was modified for simulation. ASD was considered the level cranial to the upper-instrumented segment (L3/4). Bone graft fusion in LLIF with bilateral pedicle screw (BPS) fixation occurred at L4/5. The ASD segment for each group underwent a) LLIF + posterior extension of BPS, b) PLIF + posterior extension of BPS, c) LLIF + lateral screw, and d) stand-alone LLIF. The L3/4 range of motion (ROM), interbody cage stress and strain, screw-bone interface stress, cage-endplate interface stress, and L2/3 nucleus pulposus of intradiscal pressure (NP-IDP) analysis were calculated for comparisons among the four models. Results All reconstructive models displayed decreased motion at L3/4. Under each loading condition, the difference was not significant between models a and b, which provided the maximum ROM reduction (73.8 to 97.7% and 68.3 to 98.4%, respectively). Model c also provided a significant ROM reduction (64.9 to 77.5%). Model d provided a minimal restriction of the ROM (18.3 to 90.1%), which exceeded that of model a by 13.1 times for flexion-extension, 10.3 times for lateral bending and 4.8 times for rotation. Model b generated greater cage stress than other models, particularly for flexion. The maximum displacement of the cage and the peak stress of the cage-endplate interface were found to be the highest in model d under all loading conditions. For the screw-bone interface, the stress was much greater with lateral instrumentation than with posterior instrumentation. Conclusions Stand-alone LLIF is likely to have limited stability, particularly for lateral bending and axial rotation. Posterior extension of BPS can provide reliable stability and excellent protective effects on instrumentation and endplates. However, LLIF with the use of an in situ screw may be an alternative for ASD reoperation.
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Affiliation(s)
- Ziyang Liang
- First Clinical Medical College, Guangzhou University of Chinese medicine, Guangzhou, 510405, China
| | - Jianchao Cui
- Department of Spinal Surgery, The First Affiliated Hospital of Guangzhou University of Chinese Medicine, 16 Airport Road, Guangzhou City, 510405, Guangdong Province, China
| | - Jiarui Zhang
- First Clinical Medical College, Guangzhou University of Chinese medicine, Guangzhou, 510405, China
| | - Jiahui He
- First Clinical Medical College, Guangzhou University of Chinese medicine, Guangzhou, 510405, China
| | - Jingjing Tang
- Department of Spinal Surgery, The First Affiliated Hospital of Guangzhou University of Chinese Medicine, 16 Airport Road, Guangzhou City, 510405, Guangdong Province, China
| | - Hui Ren
- Department of Spinal Surgery, The First Affiliated Hospital of Guangzhou University of Chinese Medicine, 16 Airport Road, Guangzhou City, 510405, Guangdong Province, China
| | - Linqiang Ye
- Department of Spinal Surgery, The Dongguan hospital of Chinese Medicine, Dongguan, 523000, China
| | - De Liang
- Department of Spinal Surgery, The First Affiliated Hospital of Guangzhou University of Chinese Medicine, 16 Airport Road, Guangzhou City, 510405, Guangdong Province, China
| | - Xiaobing Jiang
- Department of Spinal Surgery, The First Affiliated Hospital of Guangzhou University of Chinese Medicine, 16 Airport Road, Guangzhou City, 510405, Guangdong Province, China.
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16
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Liu X, Ma J, Park P, Huang X, Xie N, Ye X. Biomechanical comparison of multilevel lateral interbody fusion with and without supplementary instrumentation: a three-dimensional finite element study. BMC Musculoskelet Disord 2017; 18:63. [PMID: 28153036 PMCID: PMC5290599 DOI: 10.1186/s12891-017-1387-6] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/29/2016] [Accepted: 01/03/2017] [Indexed: 11/10/2022] Open
Abstract
Background Lateral lumbar interbody fusion (LLIF) is a popular, minimally invasive technique that is used to address challenging multilevel degenerative spinal diseases. It remains controversial whether supplemental instrumentation should be added for multilevel LLIF. In this study, we compared the kinematic stability afforded by stand-alone lateral cages with those supplemented by bilateral pedicle screws and rods (PSR), unilateral PSR, or lateral plate (LP) fixation using a finite-element (FE) model of a multi-level LLIF construct with simulated osteoporosis. Additionally, to evaluate the prospect of cage subsidence, the stress change characteristics were surveyed at cage-endplate interfaces. Methods A nonlinear 3-dimensional FE model of the lumbar spine (L2 to sacrum) was used. After validation, four patterns of instrumented 3-level LLIF (L2-L5) were constructed for this analysis: (a) 3 stand-alone lateral cages (SLC), (b) 3 lateral cages with lateral plate and two screws (parallel to endplate) fixated separately (LPC), (c) 3 lateral cages with bilateral pedicle screw and rod fixation (LC + BPSR), and (d) 3 lateral cages with unilateral pedicle and rod fixation (LC + UPSR). The segmental and overall range of motion (ROM) of each implanted condition were investigated and compared with the intact model. The peak von Mises stresses upon each (superior) endplate and the stress distribution were used for analysis. Results BPSR provided the maximum reduction of ROM among the configurations at every plane of motion (66.7–90.9% of intact spine). UPSR also provided significant segmental ROM reduction (45.0–88.3%). SLC provided a minimal restriction of ROM (10.0–75.1%), and LPC was found to be less stable than both posterior fixation (23.9–86.2%) constructs. The construct with stand-alone lateral cages generated greater endplate stresses than did any of the other multilevel LLIF models. For the L3, L4 and L5 endplates, peak endplate stresses caused by the SLC construct exceeded the BPSR group by 52.7, 63.8, and 54.2% in flexion, 22.3, 40.1, and 31.4% in extension, 170.2, 175.1, and 134.0% in lateral bending, and 90.7, 45.5, and 30.0% in axial rotation, respectively. The stresses tended to be more concentrated at the periphery of the endplates. Conclusions SLC and LPC provided inadequate ROM restriction for the multilevel LLIF constructs, whereas lateral cages with BPSR or UPSR fixation provided favorable biomechanical stability. Moreover, SLC generated significantly higher endplate stress compared with supplemental instrumentation, which may have increased the risk of cage subsidence. Further biomechanical and clinical studies are required to validate our FEA findings. Electronic supplementary material The online version of this article (doi:10.1186/s12891-017-1387-6) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Xilin Liu
- Department of Orthopedics, Changzheng Hospital, Second Military Medical University, 415 Fengyang Road, Shanghai, 200003, China
| | - Jun Ma
- Department of Orthopedics, Changzheng Hospital, Second Military Medical University, 415 Fengyang Road, Shanghai, 200003, China
| | - Paul Park
- Department of Neurosurgery, University of Michigan, 1500 E Medical Center Dr, Ann Arbor, MI, 48109, USA
| | - Xiaodong Huang
- Department of Orthopedics, Changzheng Hospital, Second Military Medical University, 415 Fengyang Road, Shanghai, 200003, China
| | - Ning Xie
- Department of Orthopedics, Changzheng Hospital, Second Military Medical University, 415 Fengyang Road, Shanghai, 200003, China.
| | - Xiaojian Ye
- Department of Orthopedics, Changzheng Hospital, Second Military Medical University, 415 Fengyang Road, Shanghai, 200003, China.
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Huang YP, Du CF, Cheng CK, Zhong ZC, Chen XW, Wu G, Li ZC, Ye JD, Lin JH, Wang LZ. Preserving Posterior Complex Can Prevent Adjacent Segment Disease following Posterior Lumbar Interbody Fusion Surgeries: A Finite Element Analysis. PLoS One 2016; 11:e0166452. [PMID: 27870867 PMCID: PMC5117648 DOI: 10.1371/journal.pone.0166452] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2016] [Accepted: 10/29/2016] [Indexed: 11/28/2022] Open
Abstract
Objective To investigate the biomechanical effects of the lumbar posterior complex on the adjacent segments after posterior lumbar interbody fusion (PLIF) surgeries. Methods A finite element model of the L1–S1 segment was modified to simulate PLIF with total laminectomy (PLIF-LAM) and PLIF with hemilaminectomy (PLIF-HEMI) procedures. The models were subjected to a 400N follower load with a 7.5-N.m moment of flexion, extension, torsion, and lateral bending. The range of motion (ROM), intradiscal pressure (IDP), and ligament force were compared. Results In Flexion, the ROM, IDP and ligament force of posterior longitudinal ligament, intertransverse ligament, and capsular ligament remarkably increased at the proximal adjacent segment in the PLIF-LAM model, and slightly increased in the PLIF-HEMI model. There was almost no difference for the ROM, IDP and ligament force at L5-S1 level between the two PLIF models although the ligament forces of ligamenta flava remarkably increased compared with the intact lumbar spine (INT) model. For the other loading conditions, these two models almost showed no difference in ROM, IDP and ligament force on the adjacent discs. Conclusions Preserved posterior complex acts as the posterior tension band during PLIF surgery and results in less ROM, IDP and ligament forces on the proximal adjacent segment in flexion. Preserving the posterior complex during decompression can be effective on preventing adjacent segment degeneration (ASD) following PLIF surgeries.
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Affiliation(s)
- Yun-Peng Huang
- Department of Orthopaedics, The First Affiliated Hospital of Fujian Medical University, Fuzhou City, Fujian Province, 350005, China
| | - Cheng-Fei Du
- Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control, Tianjin University of Technology, Tianjin, 300384, China
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, School of Biological Science and Medical Engineering, Beihang University, Beijing, 100191, China
| | - Cheng-Kung Cheng
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, School of Biological Science and Medical Engineering, Beihang University, Beijing, 100191, China
- Orthopaedic Device Research Center, National Yang-Ming University, 11221, Taipei, China
| | - Zheng-Cheng Zhong
- Orthopaedic Device Research Center, National Yang-Ming University, 11221, Taipei, China
| | - Xuan-Wei Chen
- Department of Orthopaedics, The First Affiliated Hospital of Fujian Medical University, Fuzhou City, Fujian Province, 350005, China
| | - Gui Wu
- Department of Orthopaedics, The First Affiliated Hospital of Fujian Medical University, Fuzhou City, Fujian Province, 350005, China
| | - Zhe-Cheng Li
- Department of Orthopaedics, The First Affiliated Hospital of Fujian Medical University, Fuzhou City, Fujian Province, 350005, China
| | - Jin-Duo Ye
- Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control, Tianjin University of Technology, Tianjin, 300384, China
| | - Jian-Hua Lin
- Department of Orthopaedics, The First Affiliated Hospital of Fujian Medical University, Fuzhou City, Fujian Province, 350005, China
- * E-mail: (JHL); (LZW)
| | - Li Zhen Wang
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, International Research Center for Implantable and Interventional Medical Devices, School of Biological Science and Medical Engineering, Beihang University, Beijing, 100191, China
- * E-mail: (JHL); (LZW)
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Clinical Outcomes of Posterior Lumbar Interbody Fusion versus Minimally Invasive Transforaminal Lumbar Interbody Fusion in Three-Level Degenerative Lumbar Spinal Stenosis. BIOMED RESEARCH INTERNATIONAL 2016; 2016:9540298. [PMID: 27747244 PMCID: PMC5056235 DOI: 10.1155/2016/9540298] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/09/2016] [Accepted: 09/05/2016] [Indexed: 12/25/2022]
Abstract
The aim of this study was to directly compare the clinical outcomes of posterior lumbar interbody fusion (PLIF) and minimally invasive transforaminal lumbar interbody fusion (MIS-TLIF) in three-level lumbar spinal stenosis. This retrospective study involved a total of 60 patients with three-level degenerative lumbar spinal stenosis who underwent MIS-TLIF or PLIF from January 2010 to February 2012. Back and leg visual analog scale (VAS), Oswestry Disability Index (ODI), and Short Form-36 (SF-36) scale were used to assess the pain, disability, and health status before surgery and postoperatively. In addition, the operating time, estimated blood loss, and hospital stay were also recorded. There were no significant differences in back VAS, leg VAS, ODI, SF-36, fusion condition, and complications at 12-month follow-up between the two groups (P > 0.05). However, significantly less blood loss and shorter hospital stay were observed in MIS-TLIF group (P < 0.05). Moreover, patients undergoing MIS-TLIF had significantly lower back VAS than those in PLIF group at 6-month follow-up (P < 0.05). Compared with PLIF, MIS-TLIF might be a prior option because of noninferior efficacy as well as merits of less blood loss and quicker recovery in treating three-level lumbar spinal stenosis.
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19
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Comer GC, Behn A, Ravi S, Cheng I. A Biomechanical Comparison of Shape Design and Positioning of Transforaminal Lumbar Interbody Fusion Cages. Global Spine J 2016; 6:432-8. [PMID: 27433426 PMCID: PMC4947403 DOI: 10.1055/s-0035-1564568] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/28/2015] [Accepted: 08/12/2015] [Indexed: 10/24/2022] Open
Abstract
STUDY DESIGN Cadaveric biomechanical analysis. OBJECTIVE The aim of this study was to compare three interbody cage shapes and their position within the interbody space with regards to construct stability for transforaminal lumbar interbody fusion. METHODS Twenty L2-L3 and L4-L5 lumbar motion segments from fresh cadavers were potted in polymethyl methacrylate and subjected to testing with a materials testing machine before and after unilateral facetectomy, diskectomy, and interbody cage insertion. The three cage types were kidney-shaped, articulated, and straight bullet-shaped. Each cage type was placed in a common anatomic area within the interbody space before testing: kidney, center; kidney, anterior; articulated, center; articulated, anterior; bullet, center; bullet, lateral. Load-deformation curves were generated for axial compression, flexion, extension, right bending, left bending, right torsion, and left torsion. Finally, load to failure was tested. RESULTS For all applied loads, there was a statistically significant decrease in the slope of the load-displacement curves for instrumented specimens compared with the intact state (p < 0.05) with the exception of right axial torsion (p = 0.062). Among all instrumented groups, there was no statistically significant difference in stiffness for any of the loading conditions or load to failure. CONCLUSIONS Our results failed to show a clearly superior cage shape design or location within the interbody space for use in transforaminal lumbar interbody fusion.
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Affiliation(s)
- Garet C. Comer
- Department of Orthopaedic Surgery, Stanford University, Redwood City, California, United States
| | - Anthony Behn
- Department of Orthopaedic Surgery, Stanford University, Redwood City, California, United States
| | - Shashank Ravi
- University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, United States
| | - Ivan Cheng
- Department of Orthopaedic Surgery, Stanford University, Redwood City, California, United States,Address for correspondence Ivan Cheng, MD Department of Orthopaedic Surgery, Stanford University450 Broadway Street, Redwood City, CA 94063United States
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Mo J, Zhang W, Zhong D, Xu H, Wang L, Yu J, Luo Z. Is Preventative Long-Segment Surgery for Multi-Level Spondylolysis Necessary? A Finite Element Analysis Study. PLoS One 2016; 11:e0149707. [PMID: 26918333 PMCID: PMC4769328 DOI: 10.1371/journal.pone.0149707] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2015] [Accepted: 02/04/2016] [Indexed: 01/31/2023] Open
Abstract
Objective For multi-level spondylolysis patients, surgeons commonly choose to fix all the segments with pars interarticularis defect even those without slippage and not responsible for clinical symptoms. In this study, we tried to study the necessity of the preventative long-segment surgery for the defected segment without slippage in treatment of multi-level spondylolysis patients from a biomechanical perspective. Method We established a bi-level spondylolysis model with pars defects at L4 and L5 segments, and simulated posterior lumbar interbody fusion (PLIF) and pedicle screw fixation at L5-S1 level. Then we compared the biomechanical changes at L4 segment before and after surgery in neutral, flexion, extension, lateral bending and axial rotation position. Results The stress on L4 pars interarticularis was very similar before and after surgery, and reached the highest in axial rotation. The L3-L4 intradiscal pressure was almost the same, while L4-L5 intradiscal pressure changed a little in lateral bending (increase from 1.993 to 2.160 MPa) and axial rotation (decrease from 1.639 to 1.307 MPa) after surgery. The PLIF surgery caused a little increase of range of motion at adjacent L4-L5 and L3-L4 levels, but the change is very tiny (1 degree). Conclusion The PLIF surgery will not cause significant biomechanical change at adjacent segment with pars defect in multi-level spondylolysis. On the contrary, excessive long-segment surgery will damage surrounding soft tissues which are important for maintaining the stability of spine. So a preventative long-segment surgery is not necessary for multi-level spondylolysis as long as there are no soft tissue degeneration signs at adjacent level.
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Affiliation(s)
- Jianqiang Mo
- Department of Orthopedics, The First Affiliated Hospital of Soochow University, Orthopedic Institute, Medical College, Soochow University, Suzhou, Jiangsu, People’s Republic of China
| | - Wen Zhang
- Department of Orthopedics, The First Affiliated Hospital of Soochow University, Orthopedic Institute, Medical College, Soochow University, Suzhou, Jiangsu, People’s Republic of China
| | - Dongyan Zhong
- Department of Orthopedics, The First Affiliated Hospital of Soochow University, Orthopedic Institute, Medical College, Soochow University, Suzhou, Jiangsu, People’s Republic of China
| | - Hao Xu
- Department of Orthopedics, The First Affiliated Hospital of Soochow University, Orthopedic Institute, Medical College, Soochow University, Suzhou, Jiangsu, People’s Republic of China
| | - Lan Wang
- Department of Orthopedics, The First Affiliated Hospital of Soochow University, Orthopedic Institute, Medical College, Soochow University, Suzhou, Jiangsu, People’s Republic of China
| | - Jia Yu
- Department of Orthopedics, The First Affiliated Hospital of Soochow University, Orthopedic Institute, Medical College, Soochow University, Suzhou, Jiangsu, People’s Republic of China
| | - Zongping Luo
- Department of Orthopedics, The First Affiliated Hospital of Soochow University, Orthopedic Institute, Medical College, Soochow University, Suzhou, Jiangsu, People’s Republic of China
- * E-mail:
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Cho PG, Park SH, Kim KN, Ha Y, Yoon DH, Shin DA. A morphometric analysis of contralateral neural foramen in TLIF. 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 2015; 24:783-90. [PMID: 25861738 DOI: 10.1007/s00586-015-3783-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2014] [Revised: 01/27/2015] [Accepted: 01/27/2015] [Indexed: 11/25/2022]
Abstract
STUDY DESIGN A retrospective review PURPOSE This study was designed to compare postoperative changes in neural foramen between transforaminal lumbar interbody fusion (TLIF) and posterior lumbar interbody fusion (PLIF). METHODS A retrospective analysis of 67 patients was compared to the change of neural foraminal morphometry of the two techniques. 33 patients (40 levels) had TLIF and 34 patients (39 levels) had PLIF. The two groups had similar demographic profiles. Radiological parameters including anterior and posterior disc height, foraminal height (FH), and segmental Cobb angle (SCA) were measured by sagittally reconstructed computed tomography images before and after surgery. Cage position was designated as contralateral, middle, and ipsilateral in the TLIF group. Surgical results were assessed by Odom criteria, visual analog scale (VAS), and Oswestry disability index (ODI) scores. RESULTS The TLIF and PLIF group showed no bilateral difference in FH. The TLIF group had increased contralateral SCA compared to the ipsilateral side postoperatively. FH differed according to cage position in the TLIF group. When a cage was inserted deeply into the contralateral side, contralateral FH increased significantly. However, when a cage was inserted into the ipsilateral side, contralateral FH decreased significantly. Back pain was significantly lower in the TLIF group at 1 and 6 months than in the PLIF group. However, ODI and Odom scale scores were not different between the groups. CONCLUSIONS TLIF may induce uneven changes in foraminal morphometry. Cage position may be the major determinant of this result.
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Affiliation(s)
- Pyung Goo Cho
- Department of Neurosurgery, Yonsei University College of Medicine, 50 Yonsei-ro, Seodaemun-gu, Seoul, 120-752, Republic of Korea
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Wang X, Xu J, Zhu Y, Li J, Zhou S, Tian S, Xiang Y, Liu X, Zheng Y, Pan T. Biomechanical analysis of a newly developed shape memory alloy hook in a transforaminal lumbar interbody fusion (TLIF) in vitro model. PLoS One 2014; 9:e114326. [PMID: 25474112 PMCID: PMC4256230 DOI: 10.1371/journal.pone.0114326] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2014] [Accepted: 11/06/2014] [Indexed: 01/04/2023] Open
Abstract
Objective The objective of this biomechanical study was to evaluate the stability provided by a newly developed shape memory alloy hook (SMAH) in a cadaveric transforaminal lumbar interbody fusion (TLIF) model. Methods Six human cadaveric spines (L1-S2) were tested in an in vitro flexibility experiment by applying pure moments of ±8 Nm in flexion/extension, left/right lateral bending, and left/right axial rotation. After intact testing, a TLIF was performed at L4-5. Each specimen was tested for the following constructs: unilateral SMAH (USMAH); bilateral SMAH (BSMAH); unilateral pedicle screws and rods (UPS); and bilateral pedicle screws and rods (BPS). The L3–L4, L4–L5, and L5-S1 range of motion (ROM) were recorded by a Motion Analysis System. Results Compared to the other constructs, the BPS provided the most stability. The UPS significantly reduced the ROM in extension/flexion and lateral bending; the BSMAH significantly reduced the ROM in extension/flexion, lateral bending, and axial rotation; and the USMAH significantly reduced the ROM in flexion and left lateral bending compared with the intact spine (p<0.05). The USMAH slightly reduced the ROM in extension, right lateral bending and axial rotation (p>0.05). Stability provided by the USMAH compared with the UPS was not significantly different. ROMs of adjacent segments increased in all fixed constructs (p>0.05). Conclusions Bilateral SMAH fixation can achieve immediate stability after L4–5 TLIF in vitro. Further studies are required to determine whether the SMAH can achieve fusion in vivo and alleviate adjacent segment degeneration.
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Affiliation(s)
- Xi Wang
- Department of Orthopaedic Surgery, The Sixth Affiliated Hospital of Sun Yat-sen University, Guangzhou, PR China
| | - Jing Xu
- Department of Orthopaedic Surgery, The Sixth Affiliated Hospital of Sun Yat-sen University, Guangzhou, PR China
| | - Yuexing Zhu
- Department of Orthopaedic Surgery, The Sixth Affiliated Hospital of Sun Yat-sen University, Guangzhou, PR China
| | - Jiukun Li
- Department of Orthopaedic Surgery, The Sixth Affiliated Hospital of Sun Yat-sen University, Guangzhou, PR China
| | - Si Zhou
- Department of Anatomy, Guilin Medical College, Guilin, PR China
| | - Shunliang Tian
- Department of Anatomy, Guilin Medical College, Guilin, PR China
| | - Yucheng Xiang
- Department of Orthopaedic Surgery, The Sixth Affiliated Hospital of Sun Yat-sen University, Guangzhou, PR China
| | - Xingmo Liu
- Department of Orthopaedic Surgery, The Sixth Affiliated Hospital of Sun Yat-sen University, Guangzhou, PR China
| | - Ying Zheng
- Department of Nutrition, Guangdong General Hospital, Guangzhou, PR China
| | - Tao Pan
- Department of Orthopaedic Surgery, The Sixth Affiliated Hospital of Sun Yat-sen University, Guangzhou, PR China
- * E-mail:
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Liu J, Tang J, Liu H. Comparison of one versus two cages in lumbar interbody fusion for degenerative lumbar spinal disease: a meta-analysis. Orthop Surg 2014; 6:236-43. [PMID: 25179359 DOI: 10.1111/os.12119] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/25/2013] [Accepted: 05/27/2014] [Indexed: 02/05/2023] Open
Abstract
OBJECTIVE To systematically compare the fusion rate and safety of lumbar interbody fusion using one cage versus two cages for the treatment of degenerative lumbar spinal diseases. METHODS All randomized controlled trials (RCTs) and comparative observational studies written in English comparing the outcome of lumbar interbody fusion using one or two cages in patients with degenerative lumbar spinal diseases were identified by a comprehensive search of PubMed Central, MEDLINE, EMBASE, BIOSIS and the Cochrane Central Registry of Controlled Trials. An exhaustive electronic search up to July 2013. The quality of the methodology was assessed and relevant data retrieved independently by two reviewers, after which the resultant data were subjected to meta-analysis. All meta-analyses were performed using Review Manager 5.0, which is recommended and provided by the Cochrane Collaboration. RESULTS Our systematic search yielded 745 studies from the selected databases. After duplicate studies had been identified and the titles and abstracts screened, 736 studies were excluded because they were irrelevant to our topic. The full texts of the remaining nine potentially relevant references were comprehensively evaluated and four excluded for the following reasons: two studies involved co-interventions and the other two lacked control groups. Two relevant RCTs and three comparative observational studies involving 384 patients and 501 spinal segments with at least one year follow-up were identified. Analysis of the pooled data demonstrated no significant difference in fusion rate between the one-cage and two-cage groups. However, intraoperative blood loss and operating time were less and the complications rate lower in the one-cage group. CONCLUSION In patients with degenerative lumbar spinal diseases, lumbar interbody fusion using one cage has an equal fusion rate and is safer compared with using two cages. However, because this meta-analysis had some limitations, more high quality RCTs are needed to strengthen the evidence.
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Affiliation(s)
- Jin Liu
- Department of Spine Surgery, Sichuan Orthopaedic Hospital; Department of Orthopaedics, West China Hospital, Sichuan University, Chengdu, China
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