A moderate amount of swelling that occurs immediately following injury and that is caused by synovial fluid and by blood in the joint is called a hemarthrosis.
Hemarthrosis, or bleeding into a joint, is a significant contributor to pain and edema in monoarticular joints.
Between the joints is a viscous liquid called synovial fluid. An examination of the synovial fluid looks for conditions that impact the joints.
When you move your joints, the fluid cushions the ends of the bones and lessens friction.
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