The Influence of Pre- and Postoperative Fear Avoidance Beliefs on Postoperative Pain and Disability in Patients With Lumbar Spinal Stenosis: Analysis of the Lumbar Spinal Outcome Study (LSOS) Data.

STUDY DESIGN Prospective multicenter cohort study. OBJECTIVE To evaluate the effect of pre- and postoperatively assessed fear avoidance beliefs (FAB) on pain and disability in patients with degenerative lumbar spinal stenosis (LSS) after decompression surgery. SUMMARY OF BACKGROUND DATA To the present, the influence of pre- and postoperative FAB on the prognosis after surgery for LLS is still unclear. METHODS Patients of the Swiss Lumbar Stenosis Outcome Study (LSOS) with confirmed LSS undergoing first-time decompression without fusion were enrolled in this study. The main outcome of this study was minimal clinically important difference (MCID) in spinal stenosis measure symptoms (pain) and function (disability) after 12 months. To analyze the influence of pre- and postoperatively assessed FAB on pain and disability we built simple and multiple logistic regression models. RESULTS In this analysis of 234 patients undergoing decompression surgery for symptomatic degenerative LSS we found baseline FAB measured by the FAB physical activity subscale (FABQ-P) not to be associated with pain (OR 0.95; 95% CI: 0.55-1.67) and disability (OR 1.11; 95% CI: 0.64-1.92) at 12 months' follow-up. In the final multiple logistic regression models patients with high FABQ-P at 6 months (OR 0.46; 95% CI: 0.24-0.91) and high persistent FABQ-P at baseline and 6 months (OR 0.34, 95% CI: 0.16-0.73) were less likely to report a MCID for spinal stenosis measure symptoms at 12 months. Our analysis found a similar trend for disability; however, the results were not statistically significant. CONCLUSION In elderly patients undergoing decompression surgery for symptomatic degenerative LSS preoperative fear avoidance beliefs were not a prognostic indicator for the outcome. Patients with FAB at 6 months and persistent FAB were less likely to experience clinically relevant improvement in pain at 12 months. Studies should address the importance of persistent postoperative FAB. LEVEL OF EVIDENCE 3.