Radiographic progression in psoriatic arthritis: head-to-head comparison of the Ratingen score and the Sharp-van der Heijde method.
OBJECTIVES To compare the psychometric properties (inter-rater reliability, agreement, responsiveness, and measurement error) of the Psoriatic Arthritis Ratingen Score (PARS) and modified Sharp-van der Heijde (SVDH) methods using the Belgian Psoriatic Arthritis (BePas) cohort. METHODS Radiographs of hands and feet (b...