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Agaronnik ND, Giberson-Chen C, Bono CM. Using advanced imaging to measure bone density, compression fracture risk, and risk for construct failure after spine surgery. Spine J 2024; 24:1135-1152. [PMID: 38437918 DOI: 10.1016/j.spinee.2024.02.018] [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: 07/04/2023] [Revised: 01/22/2024] [Accepted: 02/23/2024] [Indexed: 03/06/2024]
Abstract
Low bone mineral density (BMD) can predispose to vertebral body compression fractures and postoperative instrumentation failure. DEXA is considered the gold standard for measurement of BMD, however it is not obtained for all spine surgery patients preoperatively. There is a growing body of evidence suggesting that more routinely acquired spine imaging studies such as computed tomography (CT) and magnetic resonance imaging (MRI) can be opportunistically used to measure BMD. Here we review available studies that assess the validity of opportunistic screening with CT-derived Hounsfield Units (HU) and MRI-derived vertebral vone quality (VBQ) to measure BMD of the spine as well the utility of these measures in predicting postoperative outcomes. Additionally, we provide screening thresholds based on HU and VBQ for prediction of osteopenia/ osteoporosis and postoperative outcomes such as cage subsidence, screw loosening, proximal junctional kyphosis, and implant failure.
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Affiliation(s)
| | - Carew Giberson-Chen
- Harvard Combined Orthopaedic Residency Program, 55 Fruit Street, Yawkey Building, Suite 3A, Boston, MA 02114
| | - Christopher M Bono
- Harvard Medical School, 25 Shattuck Street, Boston, MA 02115; Harvard Combined Orthopaedic Residency Program, 55 Fruit Street, Yawkey Building, Suite 3A, Boston, MA 02114; Department of Orthopaedic Surgery, Massachusetts General Hospital, 55 Fruit Street, Yawkey Building, Suite 3A, Boston, MA 02114.
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Hiyama A, Sakai D, Katoh H, Sato M, Watanabe M. Hounsfield Unit Values as an Adjunct Diagnostic Tool: Investigating Its Relationship with Bone Mineral Density and Vertebral Bone Quality in Lumbar Degenerative Disease Patients. World Neurosurg 2024; 183:e722-e729. [PMID: 38199461 DOI: 10.1016/j.wneu.2024.01.013] [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: 11/01/2023] [Revised: 01/02/2024] [Accepted: 01/03/2024] [Indexed: 01/12/2024]
Abstract
OBJECTIVE With an increasing prevalence of osteoporosis due to demographic shifts, accurate diagnostic methods are vital, particularly before spinal surgeries. This research investigated the correlation between bone mineral density T-scores of the lumbar spine and femoral neck, Hounsfield Unit (HU) values from computed tomography (CT), and vertebral bone quality (VBQ) scores from Magnetic Resonance Imaging (MRI) in patients with lumbar degenerative disease. METHODS We analyzed data from 100 patients with lumbar degenerative disease who underwent CT, dual-energy X-ray absorptiometry (DXA), and MRI between 2019 and 2023. HU values were measured individually from L1 to L4, while T-scores were obtained from DXA scans of the lumbar spine and the femoral neck. The VBQ scores were derived from T1-weighted MRIs. RESULTS A notable association between the lumbar and femoral neck T-scores and HU values was found. The VBQ score had a faint correlation with HU values and lacked any with the T-score. Notably, the HU values derived via the Youden index and regression closely matched. Lumbar spine HU values related to T-scores of 85.6 and 84.4 and femoral neck T-scores of 98.9 and 103.6, with a low T-score at 98.9 and 104.6. CONCLUSIONS This study underscores a strong correlation between bone mineral density and HU values from CT scans in lumbar degenerative disease patients, suggesting the utility of HU measurements as an adjunct diagnostic tool for osteoporosis. However, the correlation with the VBQ score remains weak. Further multicenter studies are essential for more robust validation.
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Affiliation(s)
- Akihiko Hiyama
- Department of Orthopaedic Surgery, Tokai University School of Medicine, Isehara, Kanagawa, Japan.
| | - Daisuke Sakai
- Department of Orthopaedic Surgery, Tokai University School of Medicine, Isehara, Kanagawa, Japan
| | - Hiroyuki Katoh
- Department of Orthopaedic Surgery, Tokai University School of Medicine, Isehara, Kanagawa, Japan
| | - Masato Sato
- Department of Orthopaedic Surgery, Tokai University School of Medicine, Isehara, Kanagawa, Japan
| | - Masahiko Watanabe
- Department of Orthopaedic Surgery, Tokai University School of Medicine, Isehara, Kanagawa, Japan
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Wang J, Gao C, Zang F, Fu C, Hu B, Liang L, Yuan W, Chen H. Predictive value of vertebral Hounsfiled Unit for titanium mesh cage subsidence following ACCF surgery. Clin Neurol Neurosurg 2024; 236:108047. [PMID: 37984212 DOI: 10.1016/j.clineuro.2023.108047] [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: 09/18/2023] [Revised: 10/21/2023] [Accepted: 11/05/2023] [Indexed: 11/22/2023]
Abstract
OBJECTIVE To investigate the predictive value of cervical Hounsfiled Unit (HU) values for postoperative titanium mesh cage (TMC) subsidence. METHODS Clinical data of patients who underwent ACCF surgery for degenerative cervical myelopathy between January 2016 and August 2018 were analyzed. Among the 126 patients included, 74 were male and 52 were female, with a mean age of 61.0 ± 9.9 years. The mean follow-up was 37.1 ± 11.2 months. Preoperative vertebral HU values were measured and the degree of TMC subsidence during follow-up was assessed. Patients were divided into two groups according to the presence or absence of subsidence: the subsidence group and the control group. Vertebral HU values were compared between the two groups, and correlation analysis was performed between HU values and TMC subsidence values. In addition, the predictive value and threshold of HU were analyzed by using ROC. RESULTS There were 22 patients (14 males and 8 females) who developed TMC subsidence (subsidence group), while 104 patients (60 males and 44 females) did not develop TMC subsidence (control group) during follow-up. Comparative analysis of demographic characteristics between the two groups showed no significant differences in gender, age, BMI, diagnosis, surgical levels, and follow-up duration (all P values > 0.05). There was a significant difference in mean HU between the subsidence group (287.6 ± 49.6) and the control group (342.4 ± 61.4) (t = -3.92, P < 0.01). In the subsidence group, there was a significant correlation between subsidence values and HU values (r = -0.52, P = 0.01), whereas no such correlation was observed in the control group (r = - 0.07, P = 0.51). ROC analysis indicated that vertebral HU values could potentially be used to predict subsidence after ACCF, with an area under the ROC curve of 0.77 (95% CI 0.66-0.87; P < 0.01). The optimal HU threshold was found to be 298, with a sensitivity of 76.9% and specificity of 68.2%. CONCLUSION Preoperative vertebral HU values were associated with postoperative TMC subsidence. Vertebral HU may be a valuable predictor of postoperative subsidence.
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Affiliation(s)
- Jianxi Wang
- Spine Center, Department of Orthopedics, Changzheng Hospital, Second Military Medical University, 415th Feng Yang Road, Shanghai 200003, PR China
| | - Chenfei Gao
- Spine Center, Department of Orthopedics, Changzheng Hospital, Second Military Medical University, 415th Feng Yang Road, Shanghai 200003, PR China
| | - Fazhi Zang
- Spine Center, Department of Orthopedics, Changzheng Hospital, Second Military Medical University, 415th Feng Yang Road, Shanghai 200003, PR China
| | - Changlin Fu
- Spine Center, Department of Orthopedics, Changzheng Hospital, Second Military Medical University, 415th Feng Yang Road, Shanghai 200003, PR China
| | - Bo Hu
- Spine Center, Department of Orthopedics, Changzheng Hospital, Second Military Medical University, 415th Feng Yang Road, Shanghai 200003, PR China
| | - Lei Liang
- Spine Center, Department of Orthopedics, Changzheng Hospital, Second Military Medical University, 415th Feng Yang Road, Shanghai 200003, PR China
| | - Wen Yuan
- Spine Center, Department of Orthopedics, Changzheng Hospital, Second Military Medical University, 415th Feng Yang Road, Shanghai 200003, PR China
| | - Huajiang Chen
- Spine Center, Department of Orthopedics, Changzheng Hospital, Second Military Medical University, 415th Feng Yang Road, Shanghai 200003, PR China
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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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