Patient Satisfaction Following Lumbar Decompression: What is the Role of Mental Health?

Abstract

Objective: To determine the association between patient-reported depressive symptoms and patient satisfaction following minimally invasive lumbar decompression.

Methods: Primary, single-level/multilevel minimally invasive lumbar decompression was identified. Patient-reported outcome measures (PROMs) collected preoperatively/postoperatively included visual analog scale back/leg, Oswestry Disability Index, 9-Item Patient Health Questionnaire (PHQ-9), and 12-Item Short Form Mental Composite Score (SF-12 MCS). Patients rated current satisfaction level (0-10) with back/leg pain and disability. A paired Student's t-test compared each postoperative PROM score to its preoperative baseline. At each timepoint, patients were categorized by PHQ-9 and SF-12 MCS scores. One-way analysis of variance compared patient satisfaction with back/leg pain and disability among PHQ-9 subgroups. The Student's t-test for independent samples compared patient satisfaction between SF-12 MCS subgroups. Analysis of covariance (ANCOVA) assessed differences in satisfaction between depression subgroups while controlling for preoperative/postoperative values in corresponding PROMs.

Results: 193 patients were included. All PROMs demonstrated significant postoperative improvement from 6-weeks through 2-years (P < 0.001, all), except PHQ at 9 2-years (P = 0.874). Mean satisfaction scores ranged from 6.9-7.9 (back pain), 7.3-8.0 (leg pain), and 7.6-8.0 (disability). Satisfaction with back/leg pain and disability significantly differed among PHQ-9 subgroups at all postoperative timepoints (P < 0.001, all). Accounting for baseline and current pain/disability values, ANCOVA revealed differences between PHQ-9 subgroups only in satisfaction with back pain at 2 years (P < 0.001), leg pain at 12 weeks/1 year/2 years (P ≤ 0.047, all), and disability at 6 months/2 years (P ≤ 0.049, both). Satisfaction differed between SF-12 MCS subgroups at all timepoints (P ≤ 0.047), except back pain 6 months (P = 0.263). Accounting for baseline and postoperative pain/disability, ANCOVA revealed differences in satisfaction between SF-12 MCS groups only for back/leg pain at 2 years (P ≤ 0.001, both).

Conclusions: Independent effect of depression at long-term follow-up was significant. This highlights the importance of understanding the interaction between physical and mental health outcomes to optimize patients' perceptions of surgical outcomes.

Keywords: MIS LD; PHQ-9; SF-12; Satisfaction.