# Reliability and responsiveness of the Swedish short Hip‐RSI

## TL;DR

This study shows that the 6-item Hip-RSI scale is reliable and effective in measuring psychological readiness to return to sport after hip surgery.

## Contribution

The study confirms the reliability and responsiveness of the short Hip-RSI version in hip arthroscopy patients.

## Key findings

- The Hip-RSI has excellent test-retest reliability at both individual and group levels.
- The Hip-RSI scores correlate positively with changes in iHOT-12 scores over time.
- Patients progressing on the RTS continuum showed significant score improvements.

## Abstract

The aim of this study was to examine test–retest reliability and responsiveness of the short version (6‐item) Hip Return to Sport after Injury (Hip‐RSI) scale in patients following hip arthroscopy.

The study included 100 hip arthroscopy patients responding to a digital survey including the short version (6‐item) Hip‐RSI, International Hip Outcome Tool (short version) (iHOT‐12) and RTS status 3, 6 and 9 months following surgery. The Hip‐RSI was administered twice at 3‐month follow‐up. Test–retest reliability was evaluated using intraclass correlation coefficients. Responsiveness was tested by correlations between changes in Hip‐RSI and iHOT‐12 scores and by comparing change in Hip‐RSI scores of patients who progressed on the return to sport (RTS) continuum (from return to any sport to return to performance) to patients who did not, using independent samples t‐tests.

Hip‐RSI was found to have excellent test–retest reliability on the individual (intraclass correlation coefficient, ICC [95% confidence interval, CI]: 0.90 [0.83–0.94]) and group level (ICC [95% CI]: 0.95 [0.91–0.97]) with a standard error of measurement of 5.53 and smallest detectable change of 15.3 on the individual and 2.2 on the group level. Hip‐RSI was found responsive to change through positive correlations of changes in scores with changes in iHOT‐12 scores from 3 to 6 months (r [95% CI]: 0.51 [0.35–0.65]; p < 0.001) and from 3 to 9 months following arthroscopy (r [95% CI]: 0.61 [0.57–0.79); p < 0.001). Further responsiveness was shown by significant mean changes in scores among patients that progressed on the RTS‐continuum (3–6 months: 8.6 [95% CI: 3.8– 13.5); 3–9 months: 12.6 [5.6–19.7]).

The short version (6‐item) Hip‐RSI demonstrated excellent test–retest reliability and responsiveness to change in the evaluation of psychological readiness to RTS following hip arthroscopy.

Level II.