An overview of psoriatic arthritis - epidemiology, clinical features, pathophysiology and novel treatment targets.

Psoriatic arthritis is a chronic inflammatory joint disease occurring in a subgroup of patients suffering from psoriasis. This article gives an overview of the complexity of psoriatic arthritis, looking at several aspects of this heterogeneous disease, such as epidemiology, important clinical features and comorbidities as well as current concepts of the pathophysiology and subsequent insights in novel treatment targets.