Ultrasound of the osteoarthritic joint.

Ultrasound (US) has acquired an increasing role in the assessment of joint and periarticular abnormalities in osteoarthritis (OA). It is able to image a large set of abnormalities in this disease which include both inflammatory and structural changes at different peripheral joint sites and it is helpful in guiding local procedures that can be easily and safely performed with optimal patient's tolerance. US is a feasible imaging modality that has become a bedside procedure in the rheumatology clinical practice, thus filling the gap between clinical and radiographic evaluations of patients with OA. The present review focuses and summarises the currently available data on the applications of US in OA.