Pain Assessment in Foot and Ankle Patients

Abstract

Category: Other Introduction/Purpose: The ability to accurately quantify a patient’s pain pre-operatively is advantageous in the preparation of post-operative expectations and pain management. The Numeric Pain Rating Scale (NPRS) is a popular method to identify patient pain level. Other patient reported outcomes are being collected, such as the Patient Reported Outcomes Measurement Information System (PROMIS) and has been suggested to be more accurate in measuring pain as well as physical function. The aim of this study was to 1) determine whether NPRS or PROMIS Pain Interference (PI) demonstrates a stronger association with physical function as determined by PROMIS Physical Function (PF) and 2) to determine which method better predicts post-surgical pain in a population of elective surgical foot and ankle patients. Methods: Prospective PROMIS PF, PI and NPRS (0-10) data was obtained for common foot and ankle elective surgical procedures (CPT codes 27698, 27870, 28285, 28289, 28300, 28705, 28730, 28750) from a multi-surgeon foot and ankle clinic between February 2015 until November 2017. Pearson correlation coefficients were used to determine the relationship between NPRS (0-10) and PROMIS domains (PI, PF) pre and post-operatively. Correlations were considered high (> 0.7), high moderate (0.6-0.69), moderate (0.4-0.6) or weak ( 6 month follow up were evaluated (74% women, mean age 54+/- SD, mean follow-up 14.4 months, range 6-34 months). Pearson correlation evaluation of NPRS and PI revealed a moderate correlation in the pre- and postoperative setting. There was a high moderate negative correlation between PI and PF t-scores pre and postoperatively suggesting more pain and less function. However, the negative correlation between NPRS and PF pre- and postoperatively was weak indicating a poor relationship between NPRS pain assessment and function. There was a moderate correlation between pre- and postoperative scores in all domains of PROMIS while the correlation between pre- and postoperative NPRS scores was weak. Conclusion: In a population of elective surgical foot and ankle patients, the use of both NPRS and PROMIS can be utilized to assess pain level, however the PROMIS PI domain demonstrated a stronger relationship with PROMIS PF than NPRS. Furthermore, only the PROMIS domains demonstrated at least a moderate correlation between pre- and post-operative scores. PROMIS PI provides superior assessment of pre- and post-operative physical function and prediction of post-operative pain. PROMIS PI can be used to gauge a patient’s pre-operative level of pain and function and aid the surgeon in guiding post-operative patient expectations and pain management.