Abstract
This was a retrospective cohort study. This study evaluates the association of preoperative mental health with the rate of achieving minimal clinically important difference (MCID) in patient-reported outcomes following lumbar decompression (LD). Research is scarce regarding the influence of preoperative depression on the rate of achieving MCID for mental health, physical function, and pain among LD patients. A surgical registry was retrospectively reviewed for primary LD surgeries. Patients were grouped by depressive symptom severity according to the preoperative Patient Health Questionnaire 9 score. The association of Patient Health Questionnaire 9 subgroups with demographic and surgical variables was analyzed, and differences among subgroups were assessed. Achievement rates of MCID for physical function, pain, disability, and mental health were compared among groups at each time point using previously established MCID thresholds. Of the 321 subjects, 69.8% were male, and 170 subjects had minimal preoperative depressive symptoms, 86 had moderate, and 65 had severe. Patients in moderate and severe groups demonstrated a significantly greater rate of MCID achievement for disability at 6 weeks and 3 months postoperatively. The severe group demonstrated a significantly higher rate of achieving MCID for mental health at the 1-year time point. Patients with any range of preoperative depressive symptom severity had a similar rate of achieving MCID for pain and physical function throughout 1 year following LD. The severe depressive symptom group had a higher rate of MCID achievement with disability at 6 weeks and with mental health at 1 year. This study demonstrates that patients with any preoperative depressive symptom severity have an indistinguishable ability to attain MCID by 1 year following LD. Level III.
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