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Suer O, Aydemir S, Kilicli B, Akcali O, Ozturk AM. Should the level of the posterior instrumentation combined with the intermediate screw be a short segment or a long segment in thoracolumbar fractures with fusion to the fractured segment? Eur J Trauma Emerg Surg 2024:10.1007/s00068-024-02518-7. [PMID: 38619584 DOI: 10.1007/s00068-024-02518-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2024] [Accepted: 03/30/2024] [Indexed: 04/16/2024]
Abstract
PURPOSE It was aimed to compare the results of long segment posterior instrumentation with intermediate pedicular screw + fusion at the level of the fractured segment including one vertebra above and one below the fractured vertebra (LSPI) and short segment posterior instrumentation with intermediate pedicular screw + fusion at the level of the fractured segment including one vertebra above and one below the fractured vertebra (SSPI) in the surgical treatment of thoracolumbar vertebral fractures. METHODS Ninety patients with thoracolumbar vertebral (T11-L2) fractures operated between March 2015 and February 2022 were included in this retrospective study. The patients were divided into two groups as those who underwent LSPI (n, 54; age, 40.3) and those who underwent SSPI (n, 36; age, 39.7). Radiological evaluations like vertebral compression angle (VCA), vertebral corpus heights (VCH), intraoperative parameters, and complications were compared between the groups. RESULTS Correction in early postoperative VCA was statistically significantly better in LSPI (p = 0.003). At 1-year follow-up, postoperative VCA correction was significantly more successful in LSPI (p = 0.001). There was no difference between the two groups in terms of correction loss in VCA measured at 1-year follow-up. There was no statistically significant difference between the two groups in terms of postoperative VCH, VCH at 1-year follow-up, and correction loss in VCH. CONCLUSION LSPI provides better postoperative kyphosis correction of the fractured vertebra than SSPI. Regarding the segment level of posterior instrumentation, there was no difference between the two groups in terms of the loss of achieved correction of VCA, ABH, and PBH at 1-year follow-up. Operating a thoracolumbar fracture with LSPI will lengthen the operation and increase the number of intraoperative fluoroscopies compared to SSPI.
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Affiliation(s)
- Onur Suer
- Department of Orthopaedics and Traumatology, University of Health Sciences, Izmir Bozyaka Training and Research Hospital, Izmir, Turkey
| | - Selahaddin Aydemir
- Department of Orthopaedics Surgery, Faculty of Medicine, Dokuz Eylul University, Izmir, Turkey
| | - Bunyamin Kilicli
- Department of Orthopaedics Surgery, Faculty of Medicine, Ege University, Bornova, Izmir, Turkey
| | - Omer Akcali
- Department of Orthopaedics Surgery, Faculty of Medicine, Dokuz Eylul University, Izmir, Turkey
| | - Anil Murat Ozturk
- Department of Orthopaedics Surgery, Faculty of Medicine, Ege University, Bornova, Izmir, Turkey.
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Kwan YH, Teo HLT, Dinesh SK, Loo WL. Metallosis with spinal implant loosening after spinal instrumentation: A case report. World J Orthop 2023; 14:651-661. [PMID: 37662668 PMCID: PMC10473909 DOI: 10.5312/wjo.v14.i8.651] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/24/2023] [Revised: 06/26/2023] [Accepted: 08/01/2023] [Indexed: 08/17/2023] Open
Abstract
BACKGROUND Spinal metallosis is a rare complication following spinal instrumentation whereby an inflammatory response to the metal implants results in the development of granulomatous tissue. CASE SUMMARY We describe the case of a 78-year-old woman who had recurrence of back pain 5 years after lumbar spine posterior decompression and instrumented fusion. Lumbar spine radiographs showed hardware loosening and magnetic resonance imaging showed adjacent segment disease. Revision surgery revealed evidence of metallosis intraoperatively. CONCLUSION Spinal metallosis can present several years after instrumentation. Radiography and computed tomography may demonstrate hardware loosening secondary to metallosis. Blood metal concentrations associated with spinal metallosis have yet to be established. Hence, metallosis is still an intraoperative and histopathological diagnosis. The presence of metallosis after spinal instrumentation likely indicates a more complex underlying problem: Pseudarthrosis, failure to address sagittal balance, infection, and cross-threading of set screws. Hence, identifying metallosis is important, but initiating treatment promptly for symptomatic implant loosening is of greater paramount.
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Affiliation(s)
- Yiu Hin Kwan
- Department of Orthopaedic Surgery, Changi General Hospital, Singapore 529889, Singapore
| | - Hong Lee Terry Teo
- Department of Orthopaedic Surgery, Changi General Hospital, Singapore 529889, Singapore
| | - Shree Kumar Dinesh
- Department of Orthopaedic Surgery, Changi General Hospital, Singapore 529889, Singapore
| | - Wee Lim Loo
- Department of Orthopaedic Surgery, Changi General Hospital, Singapore 529889, Singapore
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Metallic Implants Used in Lumbar Interbody Fusion. MATERIALS 2022; 15:ma15103650. [PMID: 35629676 PMCID: PMC9146470 DOI: 10.3390/ma15103650] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Revised: 05/12/2022] [Accepted: 05/13/2022] [Indexed: 02/07/2023]
Abstract
Over the last decade, pedicle fixation systems have evolved and modifications in spinal fusion techniques have been developed to increase fusion rates and improve clinical outcomes after lumbar interbody fusion (LIF). Regarding materials used for screw and rod manufacturing, metals, especially titanium alloys, are the most popular resources. In the case of pedicle screws, that biomaterial can be also doped with hydroxyapatite, CaP, ECM, or tantalum. Other materials used for rod fabrication include cobalt-chromium alloys and nitinol (nickel-titanium alloy). In terms of mechanical properties, the ideal implant used in LIF should have high tensile and fatigue strength, Young's modulus similar to that of the bone, and should be 100% resistant to corrosion to avoid mechanical failures. On the other hand, a comprehensive understanding of cellular and molecular pathways is essential to identify preferable characteristics of implanted biomaterial to obtain fusion and avoid implant loosening. Implanted material elicits a biological response driven by immune cells at the site of insertion. These reactions are subdivided into innate (primary cellular response with no previous exposure) and adaptive (a specific type of reaction induced after earlier exposure to the antigen) and are responsible for wound healing, fusion, and also adverse reactions, i.e., hypersensitivity. The main purposes of this literature review are to summarize the physical and mechanical properties of metal alloys used for spinal instrumentation in LIF which include fatigue strength, Young's modulus, and corrosion resistance. Moreover, we also focused on describing biological response after their implantation into the human body. Our review paper is mainly focused on titanium, cobalt-chromium, nickel-titanium (nitinol), and stainless steel alloys.
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Kweh BTS, Tan T, Lee HQ, Hunn M, Liew S, Tee JW. Implant Removal Versus Implant Retention Following Posterior Surgical Stabilization of Thoracolumbar Burst Fractures: A Systematic Review and Meta-Analysis. Global Spine J 2022; 12:700-718. [PMID: 33926307 PMCID: PMC9109574 DOI: 10.1177/21925682211005411] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
STUDY DESIGN Systematic review and meta-analysis. OBJECTIVES To compare biomechanical and functional outcomes between implant removal and implant retention following posterior surgical fixation of thoracolumbar burst fractures. METHODS A search of the MEDLINE, EMBASE, Google Scholar and Cochrane Databases was conducted in accordance with the Preferred Reporting Items for Systematic reviews and Meta-Analyses (PRISMA) guidelines. RESULTS Of the 751 articles initially retrieved, 13 published articles pooling 673 patients were included. Meta-analysis revealed there was a statistically significant improvement in sagittal Cobb Angle by 16.48 degrees (9.13-23.83, p < 0.01) after surgical stabilization of thoracolumbar burst fractures. This correction decremented to 9.68 degrees (2.02-17.35, p < 0.01) but remained significant at the time of implant removal approximately 12 months later. At final follow-up, the implant removal group demonstrated a 10.13 degree loss (3.00-23.26, p = 0.13) of reduction, while the implant retention group experienced a 10.17 degree loss (1.79-22.12, p = 0.10). There was no statistically significant difference in correction loss between implant retention and removal cohorts (p = 0.97). Pooled VAS scores improved by a mean of 3.32 points (0.18 to 6.45, p = 0.04) in the combined removal group, but by only 2.50 points (-1.81 to 6.81, p = 0.26) in the retention group. Oswestry Disability Index scores also improved after implant removal by 7.80 points (2.95-12.64, p < 0.01) at 1 year and 11.10 points (5.24-16.96, p < 0.01) at final follow-up. CONCLUSIONS In younger patients with thoracolumbar burst fractures who undergo posterior surgical stabilization, planned implant removal results in superior functional outcomes without significant difference in kyphotic angle correction loss compared to implant retention.
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Affiliation(s)
- Barry Ting Sheen Kweh
- National Trauma Research
Institute, Melbourne, Victoria, Australia,Department of Neurosurgery, Royal
Melbourne Hospital, Parkville, Victoria, Melbourne,Department of Neurosurgery, The Alfred Hospital, Melbourne, Victoria, Australia,Barry Kweh, National Trauma Research
Institute, Melbourne, Victoria, Australia; Department of Neurosurgery, Royal
Melbourne Hospital, Parkville, Victoria, Melbourne; Department of Neurosurgery,
The Alfred Hospital, Melbourne, Victoria, Australia.
| | - Terence Tan
- National Trauma Research
Institute, Melbourne, Victoria, Australia,Department of Neurosurgery, The Alfred Hospital, Melbourne, Victoria, Australia
| | - Hui Qing Lee
- National Trauma Research
Institute, Melbourne, Victoria, Australia,Department of Neurosurgery, The Alfred Hospital, Melbourne, Victoria, Australia
| | - Martin Hunn
- Department of Neurosurgery, The Alfred Hospital, Melbourne, Victoria, Australia,Central Clinical School, Faculty of
Medicine, Nursing and Health Sciences, Monash University, Melbourne, Victoria,
Australia
| | - Susan Liew
- Central Clinical School, Faculty of
Medicine, Nursing and Health Sciences, Monash University, Melbourne, Victoria,
Australia,Department of Orthopaedics, The
Alfred Hospital, Melbourne, Victoria, Australia
| | - Jin Wee Tee
- National Trauma Research
Institute, Melbourne, Victoria, Australia,Department of Neurosurgery, The Alfred Hospital, Melbourne, Victoria, Australia,Central Clinical School, Faculty of
Medicine, Nursing and Health Sciences, Monash University, Melbourne, Victoria,
Australia
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Wan ZY, Shan H, Liu TF, Song F, Zhang J, Liu ZH, Ma KL, Wang HQ. Emerging Issues Questioning the Current Treatment Strategies for Lumbar Disc Herniation. Front Surg 2022; 9:814531. [PMID: 35419406 PMCID: PMC8999845 DOI: 10.3389/fsurg.2022.814531] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2021] [Accepted: 03/04/2022] [Indexed: 11/26/2022] Open
Abstract
Lumbar disc herniation is among the common phenotypes of degenerative lumbar spine diseases, significantly affecting patients' quality of life. The practice pattern is diverse. Choosing conservative measures or surgical treatments is still controversial in some areas. For those who have failed conservative treatment, surgery with or without instrumentation is recommended, causing significant expenditures and frustrating complications, that should not be ignored. In the article, we performed a literature review and summarized the evidence by subheadings to unravel the cons of surgical intervention for lumbar disc herniation. There are tetrad critical issues about surgical treatment of lumbar disc herniation, i.e., favorable natural history, insufficient evidence in a recommendation of fusion surgery for patients, metallosis, and implant removal. Firstly, accumulating evidence reveals immune privilege and auto-immunity hallmarks of human lumbar discs within the closed niche. Progenitor cells within human discs further expand the capacity with the endogenous repair. Clinical watchful follow-up studies with repeated diagnostic imaging reveal spontaneous resolution for lumbar disc herniation, even calcified tissues. Secondly, emerging evidence indicates long-term complications of lumbar fusion, such as adjacent segment disease, pseudarthrosis, implant failure, and sagittal spinal imbalance, which get increasing attention. Thirdly, systemic and local reactions (metallosis) for metal instrumentation have been noted with long-term health concerns and toxicity. Fourthly, the indications and timing for spinal implant removal have not reached a consensus. Other challenging issues include postoperative lumbar stiffness. The review provided evidence from a negative perspective for surgeons and patients who attempt to choose surgical treatment. Collectively, the emerging underlying evidence questions the benefits of traditional surgery for patients with lumbar disc herniation. Therefore, the long-term effects of surgery should be closely observed. Surgical decisions should be made prudently for each patient.
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Affiliation(s)
- Zhong Y. Wan
- Department of Orthopedics, The Seventh Medical Center of General Hospital of People's Liberation Army (PLA), Beijing, China
| | - Hua Shan
- Institute of Integrative Medicine, Shaanxi University of Chinese Medicine, Xi'an, China
| | - Tang F. Liu
- Institute of Integrative Medicine, Shaanxi University of Chinese Medicine, Xi'an, China
| | - Fang Song
- Department of Stomatology, The Specialty Medical Center Rocket Force of People's Liberation Army (PLA), Beijing, China
| | - Jun Zhang
- Department of Orthopedics, Baoji Central Hospital, Baoji, China
| | - Zhi H. Liu
- Department of Cardiac Surgery, Xijing Hospital, Air Force Medical University, Xi'an, China
| | - Kun L. Ma
- Department of Orthopedics, Yongchuan Hospital of Chongqing Medical University, Chongqing, China
| | - Hai Q. Wang
- Institute of Integrative Medicine, Shaanxi University of Chinese Medicine, Xi'an, China
- *Correspondence: Hai Q. Wang ;
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Abstract
Fretting occurs during orthodontic treatment or wearing prosthesis. Although weight of particles is marginal, the total releasing area is more of a concern due to amount and volume of molecules. The aim of the study was to examine the fretting wear resistance of orthodontic and prosthetic alloy Ni-Cr-Mo samples coated with Ti(C, N) and to compare them with samples without any coating. Five groups of cylindrical shape samples (S1–S5) made of Ni-Cr-Mo were coated with Ti(C, N) layers with different content of C and N. The control group (S0) was without layer. The alloys underwent fretting wear resistance tests with amplitude 100 μm, at frequency 0.8 Hz with averaged unit load: 5, 10, and 15 N for 15 min. The samples were subjected to microscopic observations using scanning electron microscope and a laser scanning microscope. Samples with Ti(C, N) coatings revealed higher fretting wear resistance. The wear in each case with Ti(C, N) coatings was over twice as low. The lowest wear and thus the highest resistance was demonstrated by sample S3 (1.02 µm) whereas in control group-S0 (2.64 µm). The use of Ti(C, N)-type coatings reduces the adverse effects of fretting wear, decreasing the amount of ions released during orthodontic treatment or wearing prosthesis.
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