The Prevalence and Risk Factors for S2 Alar-Iliac Screw Loosening with a Minimum 2-Year Follow-up
Study Design A retrospective cohort study. Purpose The purpose of this study was to investigate the prevalence and risk factors for S2 alar-iliac (SAI) screw loosening following lumbosacral fixation, with a minimum 2-year follow-up. Overview of Literature Although SAI screws allow surgeons to perfor...
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| Format: | Article |
| Language: | English |
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Korean Spine Society
2020-04-01
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| Series: | Asian Spine Journal |
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| Online Access: | http://www.asianspinejournal.org/upload/pdf/asj-2019-0127.pdf |
| _version_ | 1819047551691653120 |
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| author | Hiroaki Nakashima Tokumi Kanemura Kotaro Satake Kenyu Ito Yoshimoto Ishikawa Jun Ouchida Naoki Segi Hidetoshi Yamaguchi Shiro Imagama |
| author_facet | Hiroaki Nakashima Tokumi Kanemura Kotaro Satake Kenyu Ito Yoshimoto Ishikawa Jun Ouchida Naoki Segi Hidetoshi Yamaguchi Shiro Imagama |
| author_sort | Hiroaki Nakashima |
| collection | DOAJ |
| description | Study Design A retrospective cohort study. Purpose The purpose of this study was to investigate the prevalence and risk factors for S2 alar-iliac (SAI) screw loosening following lumbosacral fixation, with a minimum 2-year follow-up. Overview of Literature Although SAI screws allow surgeons to perform lumbosacral fixation with a low profile and enhanced biomechanical strength, screw loosening following surgery can occur in some cases. However, few studies have investigated the prevalence and risk factors for SAI screw loosening. Methods This retrospective study included 35 patients (mean age, 72.8±8.0 years; male, 10; female, 25) who underwent lumbosacral fixation using SAI screws with at least 2 years of follow-up. SAI screw loosening and L5–S bony fusion were assessed using computed tomography. The period for which the screws appeared loose and the risk factors for SAI screw loosening were investigated 2 years after surgery. Results A total of 70 SAI screws and 70 S1 pedicle screws were inserted. Loosening was observed 0.5, 1, and 2 years after surgery in 17 (24.3%), 35 (50.0%), and 35 (50.0%) SAI screws, respectively. Bony fusion rate at L5–S was significantly lower in patients with SAI screw loosening than in those without screw loosening (65.0% vs. 93.3%, p =0.048). The score for SAI screw contact with the iliac cortical bone and the bony fusion rate at L5–S were significantly lower in the loosening group than in the non-loosening group (1.8±0.5 vs. 2.2±0.3, p <0.001, respectively). Postoperative pelvic incidence–lumbar lordosis was significantly higher in the loosening group than in the non-loosening group (7.9°±15.4° vs. 0.5°±8.7°, p =0.02, respectively). Conclusions SAI screw loosening is closely correlated with pseudoarthrosis at L5–S. Appropriate screw insertion and optimal lumbar lordosis restoration are important to prevent postoperative complications related to SAI screws. |
| first_indexed | 2024-12-21T11:02:10Z |
| format | Article |
| id | doaj.art-5978e5266c8c415db4a91925132072d7 |
| institution | Directory Open Access Journal |
| issn | 1976-1902 1976-7846 |
| language | English |
| last_indexed | 2024-12-21T11:02:10Z |
| publishDate | 2020-04-01 |
| publisher | Korean Spine Society |
| record_format | Article |
| series | Asian Spine Journal |
| spelling | doaj.art-5978e5266c8c415db4a91925132072d72022-12-21T19:06:18ZengKorean Spine SocietyAsian Spine Journal1976-19021976-78462020-04-0114217718410.31616/asj.2019.01271133The Prevalence and Risk Factors for S2 Alar-Iliac Screw Loosening with a Minimum 2-Year Follow-upHiroaki Nakashima0Tokumi Kanemura1Kotaro Satake2Kenyu Ito3Yoshimoto Ishikawa4Jun Ouchida5Naoki Segi6Hidetoshi Yamaguchi7Shiro Imagama8 Department of Orthopedic Surgery, Konan Kosei Hospital, Konan, Japan Department of Orthopedic Surgery, Konan Kosei Hospital, Konan, Japan Department of Orthopedic Surgery, Konan Kosei Hospital, Konan, Japan Department of Orthopedic Surgery, Konan Kosei Hospital, Konan, Japan Department of Orthopedic Surgery, Konan Kosei Hospital, Konan, Japan Department of Orthopedic Surgery, Konan Kosei Hospital, Konan, Japan Department of Orthopedic Surgery, Nagoya University Graduate School of Medicine, Nagoya, Japan Department of Orthopedic Surgery, Nagoya University Graduate School of Medicine, Nagoya, Japan Department of Orthopedic Surgery, Nagoya University Graduate School of Medicine, Nagoya, JapanStudy Design A retrospective cohort study. Purpose The purpose of this study was to investigate the prevalence and risk factors for S2 alar-iliac (SAI) screw loosening following lumbosacral fixation, with a minimum 2-year follow-up. Overview of Literature Although SAI screws allow surgeons to perform lumbosacral fixation with a low profile and enhanced biomechanical strength, screw loosening following surgery can occur in some cases. However, few studies have investigated the prevalence and risk factors for SAI screw loosening. Methods This retrospective study included 35 patients (mean age, 72.8±8.0 years; male, 10; female, 25) who underwent lumbosacral fixation using SAI screws with at least 2 years of follow-up. SAI screw loosening and L5–S bony fusion were assessed using computed tomography. The period for which the screws appeared loose and the risk factors for SAI screw loosening were investigated 2 years after surgery. Results A total of 70 SAI screws and 70 S1 pedicle screws were inserted. Loosening was observed 0.5, 1, and 2 years after surgery in 17 (24.3%), 35 (50.0%), and 35 (50.0%) SAI screws, respectively. Bony fusion rate at L5–S was significantly lower in patients with SAI screw loosening than in those without screw loosening (65.0% vs. 93.3%, p =0.048). The score for SAI screw contact with the iliac cortical bone and the bony fusion rate at L5–S were significantly lower in the loosening group than in the non-loosening group (1.8±0.5 vs. 2.2±0.3, p <0.001, respectively). Postoperative pelvic incidence–lumbar lordosis was significantly higher in the loosening group than in the non-loosening group (7.9°±15.4° vs. 0.5°±8.7°, p =0.02, respectively). Conclusions SAI screw loosening is closely correlated with pseudoarthrosis at L5–S. Appropriate screw insertion and optimal lumbar lordosis restoration are important to prevent postoperative complications related to SAI screws.http://www.asianspinejournal.org/upload/pdf/asj-2019-0127.pdfs2 alar-iliac screwbony fusionscrew looseningrisk factors |
| spellingShingle | Hiroaki Nakashima Tokumi Kanemura Kotaro Satake Kenyu Ito Yoshimoto Ishikawa Jun Ouchida Naoki Segi Hidetoshi Yamaguchi Shiro Imagama The Prevalence and Risk Factors for S2 Alar-Iliac Screw Loosening with a Minimum 2-Year Follow-up Asian Spine Journal s2 alar-iliac screw bony fusion screw loosening risk factors |
| title | The Prevalence and Risk Factors for S2 Alar-Iliac Screw Loosening with a Minimum 2-Year Follow-up |
| title_full | The Prevalence and Risk Factors for S2 Alar-Iliac Screw Loosening with a Minimum 2-Year Follow-up |
| title_fullStr | The Prevalence and Risk Factors for S2 Alar-Iliac Screw Loosening with a Minimum 2-Year Follow-up |
| title_full_unstemmed | The Prevalence and Risk Factors for S2 Alar-Iliac Screw Loosening with a Minimum 2-Year Follow-up |
| title_short | The Prevalence and Risk Factors for S2 Alar-Iliac Screw Loosening with a Minimum 2-Year Follow-up |
| title_sort | prevalence and risk factors for s2 alar iliac screw loosening with a minimum 2 year follow up |
| topic | s2 alar-iliac screw bony fusion screw loosening risk factors |
| url | http://www.asianspinejournal.org/upload/pdf/asj-2019-0127.pdf |
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