Chetan Khatri, Conrad J Harrison, Nick D Clement, Chloe E H Scott, Deborah MacDonald, Andrew J Metcalfe, Jeremy N Rodrigues
BACKGROUND: The Forgotten Joint Score (FJS), a commonly used patient-reported outcome measure, was developed without fully confirming assumptions such as unidimensionality (all items reflect 1 underlying factor), appropriate weighting of each item in scoring, absence of differential item functioning (in which different groups, e.g., men and women, respond differently), local dependence (pairs of items are measuring only 1 underlying factor), and monotonicity (persons with higher function have a higher score)...
March 19, 2024: Journal of Bone and Joint Surgery. American Volume