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Evaluation of PROMIS Outcomes for Surgical Treatment of Cubital Tunnel Syndrome With and Without Carpal Tunnel Syndrome.

BACKGROUND
Assessment of outcomes for cubital tunnel syndrome (CuTS) surgeries has been difficult due to heterogeneity in outcome reporting. Our objective was to evaluate the outcomes for 2 cohorts treated surgically for isolated CuTS and for combined CuTS and carpal tunnel syndrome (CTS) using Patient Reported Outcomes Measurement Information System (PROMIS).


METHODS
There were 29 patients in the isolated CuTS cohort and 30 patients in the combined CuTS and CTS cohort. PROMIS Physical Function (PF), Pain Interference (PI), Depression, and Upper Extremity (UE) were completed preoperatively and 1-week, 6-weeks, and 3-months postoperatively. Responsiveness was evaluated by standardized response means (SRM).


RESULTS
Significant improvements from the 1-week to 6-week postoperative period are shown in the isolated CuTS cohort for PROMIS PF (P = .002), PI (P = .0002), and UE (P = .02), but scores plateau after 6-weeks postoperatively. A similar pattern for the same time points was seen for the combined CuTS and CTS group for PROMIS PF (P = .001), PI (P = .02), and UE (P = .04), with a plateau of scores beyond 6 weeks postoperatively. PROMIS UE was more responsive (SRM range: 0.11-1.03) than the PF (SRM range: 0.02-0.52) and PI (SRM range: 0.11-0.40), which were both mildly responsive for both cohorts.


CONCLUSIONS
PROMIS lacks the sensitivity to show improvement beyond 6-weeks postoperatively for both isolated CuTS and combined CuTS and CTS. Patients with combined nerve compressions follow similar trajectories in the postoperative period as those with isolated CuTS.


LEVEL OF EVIDENCE
Level IV.