Retrospective review of prospective data.Objective.
Determine whether patient reported outcome (PRO) data collected prior to lumbar discectomy predicts achievement of a minimal important difference (MID) after surgery. Compare ability of PRO and clinical information to predict achievement of MID in short term follow-up after discectomy.Summary of Background Data.
We investigated the ability of Patient Reported Outcomes Measurement Information System (PROMIS) and clinical factors at the pre-operative time point to determine patients achieving MID after surgery.Methods.
PROMIS Physical Function (PF), Pain Interference (PI), and Depression (D) scores were assessed at evaluation and follow-up for consecutive visits between February, 2015 and September, 2017. Patients with pre-operative scores within 30 days prior to surgery and with scores 40 days or more after surgery who completed all PROMIS domains were included yielding 78 patients. MIDs were calculated using a distribution-based method. A multivariate logistic regression model was created, and the ability to predict achieving MID for each of the PROMIS domains was assessed. Cut-off values and prognostic probabilities were determined for this model and models combining pre-operative PROMIS with clinical data.Results.
Pre-operative PROMIS scores modestly predict reaching MID after discectomy (areas under the curve (AUC) of 0.62, 0.68, and 0.76 for PF, PI, and D respectively). Pre-operative cut-off scores show patients who have PF and PI scores more than 2 standard deviations, and D more than 1.5 standard deviations worse-off than population mean are likely to achieve MID. The combination of PROMIS with clinical data was the most powerful predictor of reaching MID with AUCs of 0.87, 0.84, and 0.83 for PF, PI, and D.Conclusions.
PROMIS scores before discectomy modestly predict improvement after surgery. Pre-operative PROMIS combined with clinical factors was more predictive of achieving MID than either clinical factors or PROMIS alone.Conclusions.
Level of Evidence: 3