Study investigators will perform a prospective, multi-center, international cohort study involving approximately 30 sites that specialize in care of patients with PsA. 540 patients with a rheumatologist-confirmed diagnosis of PsA who are initiating advanced therapy for peripheral musculoskeletal manifestations of PsA will be enrolled. The study will include 2 in-person physician visits. Visit 1 (baseline) will take place prior to drug initiation (up to 3 months prior). Visit 2 (follow-up) will occur 3-6 months following drug initiation. In addition, study sites will be asked to report persistence status on the study drug at 1 year.
