Over the past 30 years, there has been increasing recognition of psoriatic arthritis as a distinct clinical entity. Psoriatic arthritis occurs mostly in patients with psoriasis and may affect up to 1% of the general population. It has many similarities to other forms of spondyloarthritis, and must be differentiated from related conditions. Given that most patients with psoriatic arthritis have skin and musculoskeletal diseases that significantly affect their quality of life and function, patients are ideally managed in a multidisciplinary clinic with rheumatologists, dermatologists and a...