PROMIS Physical Function Score Strongly Correlates With Legacy Outcome Measures in Minimally Invasive Lumbar Microdiscectomy

Benjamin Khechen, BA; Brittany E. Haws, MD; Dil V. Patel, BS; Mundeep S. Bawa, BA; Islam M. Elboghdady, MD; Eric H. Lamoutte, BS; Sailee S. Karmarkar, BS; Kern Singh, MD


Spine. 2019;44(6):442-446. 

In This Article


Patient Population

Institutional review board approval was obtained for this study (ORA#14051301). A prospective database of MIS LD patients was retrospectively reviewed. Patients who underwent a 1–3 level MIS LD by a single surgeon from 2015 to 2017 were considered for inclusion. Patients were excluded if full PRO data was not available or if undergoing surgery for degenerative disc disease.

Data Collection

Patient baseline and perioperative characteristics were obtained from the surgical database. Patient characteristics included age, sex, smoking status, insurance type, body mass index, Charlson Comorbidity Index, and preoperative diagnosis. Perioperative variables included procedure type, operative levels, operative time, estimated intraoperative blood loss, and length of postoperative stay. Complications occurring during the intraoperative and immediate postoperative period were recorded. PROs including PROMIS PF, ODI, VAS back, and VAS leg pain were administered preoperatively and at 6-week, 12-week, and 6-month follow-up.

Statistical Analysis

Statistical analysis was performed using Stata/MP 13.1 for Mac (StataCorp LP, College Station, TX). Changes in PROs from preoperative to postoperative time points were assessed using paired t tests. Associations between PROMIS PF and legacy PRO scores were evaluated at each time point using Pearson correlation coefficients (r). Strength of association was defined as 0.1 ≤ |r| < 0.3, 0.3 ≤ |r| < 0.5, and |r| ≥ 0.5 representing weak, moderate, and strong correlations, respectively.[11] Statistical significance was set at P < 0.05.