A Systematic Review of Measurement Properties of the Forgotten Joint Score (FJS) Based on the COSMIN Guideline

Abstract

Objective: This study aimed to comprehensively assess the measurement properties of the Forgotten Joint Score (FJS) in patients undergoing total knee arthroplasty (TKA). Methods: A systematic review of the measurement properties of the FJS was conducted according to the Consensus-Based Standards for the Selection of Health Measurement Instruments (COSMIN). We systematically searched PubMed, Web of Science, The Cochrane Library, Medline, Embase, Psych Info, CNKI, and VIP Database from inception to December 1, 2023. Studies focusing on postTKA patients were included, and the measurement properties of the FJS were systematically described. Results: Eleven studies covering 11 language versions of the FJS were included. Methodological quality for content validity was rated as adequate, with an overall measurement property rating of sufficient. For structural validity, methodological quality was doubtful and the measurement property was indeterminate. Both internal consistency and reliability were rated as very good in methodological quality and sufficient as measurement properties. Structural validity, crosscultural validity, and criterion validity could not be assessed due to insufficient information. Responsiveness showed doubtful methodological quality and insufficient measurement properties. Hypothesis testing was rated as inadequate in methodological quality and insufficient as a measurement property. GRADE ratings indicated sufficient content validity, indeterminate structural validity, highquality evidence for internal consistency and reliability, and insufficient evidence for measurement error and responsiveness. Conclusion: The FJS demonstrates good reliability and validity. Future research should fill the gaps in the evaluation of structural validity, crosscultural validity, and criterion validity, and improve hypothesis testing studies, so as to fully and accurately determine whether the FJS is suitable for use in Chinese TKA patients.