Radiologic adjacent segment degeneration 2 years after lumbar fusion for degenerative spondylolisthesis.

Abstract:

INTRODUCTION:Lumbar fusion is now a currently accepted treatment for degenerative lumbar spondylolisthesis (DLSP), but may induce adjacent segment degeneration (ASD). The present study hypothesis was that there are radiological parameters associated with ASD. The study objective was to determine predictive factors of ASD. MATERIAL AND METHODS:A single-center retrospective study included patients operated on between 2006 and 2013 for DLSP. Radiological parameters were analyzed on preoperative, immediate postoperative and final follow-up lateral X-ray. ASD was defined by the following adjacent segment criteria:>3mm anteroposterior translation,>10° segmental kyphosis, or>50% loss of disc height. RESULTS:One hundred and seven patients were included: 79% female; mean age, 67±10.2 years. Fusion involved 1 level in 67% of cases and 2 or more in 33%, with transforaminal lumbar interbody fusion (TLIF) in 27% of cases. There was overall significant gain in lumbar lordosis (mean, 3.1°; P=0.04). At a mean 27.8 months' follow-up, 29% of cases showed ASD and 10% required surgical reintervention. Preoperative anterior imbalance and long fusion (>2 levels) were significantly associated with ASD (OR=2.81, 95% CI [1.17-6.74] versus OR=2.76, 95% CI [1.15-6.63]). There were no significant differences according to postoperative radiological parameters, or to TLIF (OR=1.8, 95% CI [0.7-4.4]). CONCLUSION:Twenty-nine percent of patients developed ASD, with a surgical revision rate of 10%. ASD risk factors comprised high number of instrumented levels and preoperative sagittal imbalance. LEVEL OF EVIDENCE:IV, retrospective cohort.

authors

Moreau PE,Ferrero E,Riouallon G,Lenoir T,Guigui P

doi

10.1016/j.otsr.2016.03.012

subject

Has Abstract

pub_date

2016-10-01 00:00:00

pages

759-63

issue

6

issn

1877-0568

pii

S1877-0568(16)30015-9

journal_volume

102

pub_type

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