概述
PsA is a chronic, inflammatory, musculoskeletal disease affecting approximately one quarter of people with the skin condition psoriasis . PsA is a highly heterogeneous disease, encompassing diverse musculoskeletal manifestations or ‘domains’ resulting from disease activity in different tissues. These include peripheral arthritis, spondylitis (axial inflammation), dactylitis (inflammation of the whole digit) and enthesitis (inflammation where a tendon, ligament or joint capsule insert to the bone)