Postoperative Sagittal Balance has Only a Limited Role in the Development of Adjacent Segment Disease after Lumbar Spine Fusion for Degenerative Lumbar Spine Disorders : A Subanalysis of the 10-year Follow-up Study
Toivonen, L. A., Mäntymäki, H., Häkkinen, A., Kautiainen, H., & Neva, M. H. (2022). Postoperative Sagittal Balance has Only a Limited Role in the Development of Adjacent Segment Disease after Lumbar Spine Fusion for Degenerative Lumbar Spine Disorders : A Subanalysis of the 10-year Follow-up Study. Spine, 47(19), 1357-1361. https://doi.org/10.1097/BRS.0000000000004400
© 2022 The Author(s). Published by Wolters Kluwer Health, Inc.
Study Design. Retrospective Additional Analysis of a Prospective Follow-up Study. Objectives. We aimed to find out whether poor postoperative sagittal alignment increases revisions for adjacent segment disease (ASD) after lumbar spine fusion (LSF) performed for degenerative lumbar spine disease (DLSD). Summary of Background Data. Revisions for ASD accumulate over time after LSF for DLSD. The etiology of ASD is considered multifactorial. Yet, the role of postoperative sagittal balance in this process remains controversial. Methods. 215 consecutive patients who had undergone an elective LSF surgery for spinal stenosis with (80%) or without (20%) spondylolisthesis were analyzed. Spinal reoperations were collected from the hospital records. Pre- and postoperative sagittal alignment were evaluated from standing radiographs. The risk of revisions for ASD was evaluated by Cox proportional hazards regression models. Results. We did not find the poor postoperative balance (pelvic incidence – lumbar lordosis > 9°) to significantly increase the risk of revisions for ASD: crude hazard ratio (HR) 1.5 (95% CI 0.8–2.7), adjusted (by age, sex, pelvic incidence, fusion length, and the level of the caudal end of fusion) HR 1.7 (95% CI 0.9–3.3). We found higher lumbar lordosis outside the fusion segment (LL – segmental lordosis) to decrease the risk of revisions for ASD: HR 0.9 (95% CI 0.9–1.0). Conclusion. Poor sagittal balance has only a limited role as a risk factor for the revisions for ASD among patients with degenerative spinal disease. However, the risk for ASD might be the greatest among patients with reduced spinal mobility. Level of Evidence. 3 ...
PublisherLippincott Williams & Wilkins
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- Liikuntatieteiden tiedekunta 
Additional information about fundingThis study was funded by the Competitive State Financing of the Expert Responsibility Area of Tampere University Hospital.
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