The forgotten joint score-12 is a valid and responsive outcome tool for measuring success following hip arthroscopy for femoroacetabular impingement syndrome

• Published in: Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA sports traumatology, arthroscopy : official journal of the ESSKA, 2021-05, Vol.29 (5), p.1378-1384
• Main Authors: Robinson, Patrick G., Rankin, C. S., Murray, I. R., Maempel, J. F., Gaston, P., Hamilton, D. F.
• Format: Article
• Language: English
• Subjects: Arthroscopy; Correlation coefficient; Correlation coefficients; English language; Evaluation; Hip; Impingement; Language; Medicine; Medicine & Public Health; Orthopedics; Sports Medicine; Validation studies; Validity
• ISSN: 0942-2056; 1433-7347
• DOI: 10.1007/s00167-020-06138-7

Purpose The forgotten joint score-12 (FJS-12) is an outcome questionnaire designed to evaluate joint awareness. The responsiveness and validity of the English language version of the FJS-12 in patients undergoing hip arthroscopy for femoroacetabular impingement (FAI) is not known. Methods Consecutive patients undergoing hip arthroscopy for a diagnosis of FAI were prospectively followed up over a 1 year period. Patients completed preoperative and postoperative FJS-12, EuroQol 5 Dimension (EQ-5D-5L), and the 12-item international hip outcome tool (iHOT-12). We evaluated construct validity with Spearman correlation coefficients for the FJS-12, and responsiveness by way of effect size and ceiling effects. Results Forty-six patients underwent hip arthroscopy, of which 42 (91%) completed post-operative PROMs at 1 year follow-up. Construct validity was strong with the iHOT-12 ( r  = 0.87) and also the EQ-5D-5L ( r  = 0.83). The median postoperative FJS score was 50.2 (IQR 64). The mean change in score for the FJS-12 was 31 points (SD 31) ( p