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Signs and symptoms of knee effusion include: 1  Puffiness and swelling in the knee. 2  Pain when bearing weight. 3  Stiffness or reduced range of motion due to increased fluid.  One knee appears noticeably larger than the 1  other. May feel warm to the touch.
A SUDDEN appearance of knee swelling always suggests KNEE EFFUSION and possibly HEMARTHROSIS (blood in the joint). If there is any history of mild injury or trauma to the knee within the last 24-48 hours,... Read Full Thread Ask a Doctor Now Â».