Imaging in peripheral and axial psoriatic arthritis: contributions to diagnosis, follow-up, prognosis and knowledge of pathogenesis.

Imaging in psoriatic arthritis (PsA) is rapidly evolving, and the use of sensitive modalities both in clinical research and routine care is increasing. This article provides an overview of current knowledge of different imaging methods in PsA, including current and possible future use in diagnosis, prognosis and clinical management, value in understanding pathogenesis, and latest activities to establish responsive imaging outcome measures. Much research remains to be performed concerning imaging in PsA, particularly on its optimal use in routine clinical care, the clinical consequences of imaging-detected subclinical disease, and specific and sensitive PsA imaging outcome measures.