Worse Preoperative 12-Item Veterans Rand Physical Component Scores Prognosticate Inferior Outcomes Following Outpatient Lumbar Decompression

Abstract

Study design: Retrospective Review.

Objective: Evaluate the influence of the 12-Item veterans Rand (VR-12) physical component score (PCS) on patient-reported outcome measures (PROMs) in an outpatient lumbar decompression (LD) cohort.

Summary of background data: The influence of baseline VR-12 PCS on postoperative clinical outcomes has not been evaluated in patients undergoing outpatient LD.

Methods: Patients undergoing primary, elective, 1/2-level outpatient LD with baseline VR-12 PCS scores were retrospectively identified from a prospectively maintained single-surgeon database. Cohorts were preoperative VR-12 PCS<30 and VR-12 PCS≥30. Patient/perioperative characteristics and preoperative/postoperative 6-week/final follow-up (FF) PROMs were collected. Physical health PROMs included the VR-12 PCS, 12-Item Short Form (SF-12) PCS, patient-reported outcome measure information system-physical function (PROMIS-PF), visual analog scale (VAS)-back/leg, and Oswestry disability index (ODI). Mental health PROMs included the VR-12/SF-12 mental component score (MCS) and the patient-health questionnaire-9 (PHQ-9). Average FF was 13.8±8.9 months postoperatively. PROM improvements at 6 weeks/FF and minimal clinically important difference (MCID) achievement rates were determined. χ 2 analysis and the Student's t tests compared demographics, perioperative data, and preoperative PROMs. Multivariate linear/logistic regression compared postoperative PROMs, PROM improvements, and MCID achievement rates.

Results: Six weeks postoperatively, VR-12 PCS<30 reported worse baseline PROMs ( P ≤0.042, all) and worse scores except VR-12/SF-12 MCS ( P ≤0.043, all). Compared with VR-12 PCS≥30, VR-12 PCS<30 had worse FF VR-12 PCS, SF-12 PCS/MCS, PROMIS-PF, PHQ-9, and VAS-Back ( P ≤0.033, all). VR-12 PCS<30 experienced greater 6-week improvements in VR-12/SF-12 PCS, PHQ-9, VAS-Back, and ODI ( P ≤0.039, all). VR-12 PCS<30 had greater FF improvements in VR-12/SF-12 PCS, PHQ-9, and ODI ( P ≤0.001, all) and greater overall MCID achievement in VR-12 PCS/MCS, SF-12 PCS, PHQ-9, and ODI ( P ≤0.033, all).

Conclusions: VR-12 PCS<30 patients-reported worse baseline/postoperative mental/physical health scores. However, they reported greater improvements in physical function, depressive burden, back pain, and disability by 6 weeks and FF and experienced greater MCID achievement for physical functioning, mental health, and disability scores.