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Abstract Purpose The aim of this study was to calculate and provide Patient Acceptable Symptom State (PASS) thresholds, Minimum Clinically Important Difference (MCID), and Minimal Important Change (MIC) values for the ACL‐Return to Sport after Injury (ACL‐RSI) scale and the Knee Self‐Efficacy Scale (K‐SES) in patients treated with ACL reconstruction. Method Data were extracted from a rehabilitation specific registry, Project ACL. The registry prospectively collects patient‐reported outcomes (PROs). PASS, MCID and MIC were calculated using receiver operating characteristic (ROC) curve analysis and anchor‐based methods. Calculations were made for patients who completed the ACL‐RSI and K‐SES 18 at follow‐up points 4 (K‐SES 18 only), 8, 12 and 18 months post‐surgery. Results A total of 704 patients aged 15–50 year, who underwent ACL reconstruction were included. The PASS thresholds increased over time, with AUC values indicating acceptable discrimination at all follow‐ups, especially at 18 months. The MCID values ranged from 1.6–4.1 for the K‐SES 18 and 13.6–30.4 for the ACL‐RSI. The MIC values varied between follow‐ups, with negative or near‐zero values observed at certain intervals, particularly for K‐SES 18 future. Conclusion The PASS, MCID and MIC values for the K‐SES 18 and the ACL‐RSI vary over time. Practical thresholds are provided for clinicians to better interpret scores and to determine if meaningful improvements have been achieved. Level of Evidence Level III.
Piussi et al. (Thu,) studied this question.