Determining the Validity, Reliability, and Utility of the Forgotten Joint Score: A Systematic Review

With improving patient outcome after total hip and total knee arthroplasty, patient-reported outcome measures (PROMs) have seen a parallel rise in average scores and ceiling effects. The Forgotten Joint Score (FJS) is a PROM that has been previously proposed to reduce this observed ceiling effect. However, the validity and reliability of the FJS has not been well analyzed. The US National Library of Medicine (PubMed/MEDLINE), EMBASE, and the Cochrane Database of Systematic Reviews were queried using keywords pertinent to FJS, validity, reliability, measurement properties, and PROM. The methodological quality of measurement properties was evaluated using the COnsensus-based Standards for the selection of health Measurement INstruments (COSMIN) checklist. In total, 13 articles met the inclusion criteria and were included in this analysis. Internal consistency was consistently high (Cronbach alpha >0.9). Test-retest reliability was good or excellent (interclass correlation coefficient ≥0.8) in all studies. As for construct validity, all the articles reported a positive rating. Floor and ceiling effects overall were low (