Synovitis

Inflammation of the membrane lining a joint capsule. The condition may be acute, in which case it is usually caused by an attack of arthritis, injury, or infection; or chronic, as in a disorder such as rheumatoid arthritis. The affected joint becomes swollen, painful, and often warm and red. To find the cause, joint aspiration or biopsy may be needed. Symptoms are relieved by rest, supporting the joint with a splint or cast, analgesics, nonsteroidal anti-inflammatory drugs, and, occasionally, a corticosteroid injection. Chronic synovitis may be treated by synovectomy.