Bleeding or blood accumulation inside a joint, usually caused by injury, which causes swelling and pain.
From Greek 'hema' (blood) + 'arthron' (joint) + 'osis' (condition), describing a pathological state where blood pools within the synovial cavity of a joint.
Hemarthrosis is a signature injury in people with hemophilia—in the past, they'd suffer repeat joint bleeds that would destroy cartilage, but modern treatment has changed outcomes dramatically.
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