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a disorder characterized by a periodically recurring serous effusion into the cavity of a joint; the articulation may be the seat of a chronic arthritis or may apparently be normal in the intervals between the attacks.
Recurring attacks of swelling of the large joints, lasting 2 to 5 days and then remitting spontaneously. The condition affects men and women equally. The period between attacks is commonly 2 to 4 weeks, during which time the joint is normal. The knee is usually involved, but the elbow, hip, and ankle also may be affected.
See also: hydrarthrosis