Psychometric Properties of the Hip-Return to Sport After Injury Scale (Short Form) for Evaluating Psychological Readiness to Return to Sports After Arthroscopic Hip Surgery

Background: Successful return to sports activity after surgery requires both physical and psychological readiness. The Hip-Return to Sport After Injury (Short Form) has been developed to assess psychological readiness to return to sports after hip injury and hip surgery, including hip arthroscopy. Purpose: To evaluate the reliability, validity, responsiveness, and interpretability of the scale for a cohort of patients after hip arthroscopy with a range of sports participation levels. Study Design: Cohort study (diagnosis); Level of evidence, 2. Methods: Invitations to participate were sent to 145 patients from 3 specialist surgeons. The study included 77 participants 1 to 24 months after hip arthroscopy (mean +/- SD age, 35 +/- 9 years; 62% women) and 33 healthy age-matched controls (age, 37 +/- 7 years; 52% women). The scale was administered electronically on 3 occasions to patients: baseline (>= 1 month postarthroscopy), 1 week later, and 6 months later. In addition to the scale, participants were asked about sports participation status and their global rating of postsurgical change. The scale was administered to healthy controls on 1 occasion. The minimal detectable difference, discriminant validity, floor and ceiling effects, responsiveness, and interpretability (minimally important change) were determined for the scale. Results: Among the postarthroscopy group, excellent test-retest reliability was found (intraclass correlation coefficient = 0.869; 95% CI, 0.756-0.932) with a minimal detectable difference of 26 points out of 100 at the individual level and 4 points out of 100 at the group level. At baseline discriminant validity was evident between those who had returned to sports (median = 69, n = 35) and those who had not returned to sports (median = 30, n = 42; Mann-Whitney U score = 232.5, z = -5.141, P < .001) and between the returned-to-sports postarthroscopy group and healthy controls (median = 96, n = 33; Mann-Whitney U score = 165.500, z = 5.666, P < .001). No floor or ceiling effects were evident. Responsiveness was demonstrated for the scale in relation to sports status. With sports status as an anchor, a minimally important change of 26 points was identified. Conclusion: Assessment of the Hip-Return to Sport After Injury (Short Form) supports its use as a reliable and valid measure of psychological readiness to return to sports in patients after hip arthroscopy.