Abstract
Purpose
The aim of this study is to determine whether there is a relationship between radiographic slip progression and symptomatic worsening after decompression without fusion for low-grade degenerative lumbar spondylolisthesis (DLS).
Methods
A retrospective review of 1–2-level minimally invasive surgical decompression for grade I–II DLS was performed. Included subjects had a minimum of 1-year follow-up with prospectively collected baseline and follow-up Oswestry Disability Index (ODI) scores.
Results
Fifty-six patients (33 females, 58.9%), having a mean age 65.6 years (SD 10.0), met inclusion criteria. Spondylolisthesis slip percentage increased in 55.4% (31/56) of patients. Slip percentage increased significantly (p = 0.002) from baseline (mean 17.2; SD 8.0) to follow-up (mean 20.1; SD 9.6). A logistic regression model identified that females were more likely to have progressive slips compared to males (odd ratio 6.09, 95% CI 1.77–21.01; p = 0.004). ODI scores and spondylolisthesis slip percentage did not correlate at baseline (r = 0.0170; p = 0.90) nor follow-up (r = 0.094; p = 0.49). There was no correlation between the change in ODI scores and change in slip percentage from baseline to final follow-up (r = 0.0474; p = 0.73). Of the 31 patients with slip progression, there was no difference in mean ODI score changes (p = 0.91) for those with 1–5% progression (13/31 [41.9%]; − 18.0 [SD 19.7]) compared to those with > 5% slip progression (18/31 [58.1%]; − 18.7 [SD 16.4]).
Conclusions
Despite a small degree of slip progression in the majority of patients, there was no correlation with symptom worsening, as measured by the ODI.
Graphic abstract
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The project received research ethics board approval at the Toronto Western Hospital, University Health Network (Toronto, Canada), which is where the work originated.
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The authors declare that they have no direct conflict of interest. Y.R. Rampersaud is a consultant for and has roylaties from Medtronic.
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Ravinsky, R.A., Crawford, E.J., Reda, L.A. et al. Slip progression in degenerative lumbar spondylolisthesis following minimally invasive decompression surgery is not associated with increased functional disability. Eur Spine J 29, 896–903 (2020). https://doi.org/10.1007/s00586-020-06336-4
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DOI: https://doi.org/10.1007/s00586-020-06336-4