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

Patrick G. Robinson*, C.S. Rankin, I.R. Murray, J.F. Maempel, P. Gaston, D.F. Hamilton

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

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 1year period. Patients completed preoperative and postoperative FJS-12, EuroQol 5 Dimension (EQ-5D-5L), and the 12-iteminternational hip outcome tool (iHOT-12). We evaluated construct validity with Spearman correlation coefficients for theFJS-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 post operative FJS score was 50.2 (IQR 64). The mean change in score for the FJS-12 was 31 points (SD 31) (p<0.001), with an effect size (Cohen’s d) of 1.16. Preoperatively, three patients scored the lowest possible value resulting in a floor effect of 7.1%.Similarly, only three patients (7.1%) scored the best possible score post-operatively. Conclusion: This is the first evaluation of the joint awareness concept in the English language version of the FJS-12 following hip arthroscopy for FAI. The FJS-12 is a valid and responsive tool for the assessment of this cohort of patients. Level of evidence: II.
Original languageEnglish
Pages (from-to)1378-1384
Number of pages7
JournalKnee Surgery, Sports Traumatology, Arthroscopy
Volume29
Early online date20 Jul 2020
DOIs
Publication statusPublished - May 2021

Keywords

  • hip
  • psychometric
  • FJS-12
  • ceiling
  • FAI

ASJC Scopus subject areas

  • Surgery
  • Orthopedics and Sports Medicine

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