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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.
Treatments vary, depending on the cause of the swelling, so an accurate diagnosis is the first step in treating the swelling on your knee. According to an article in American Family Physician, the most common traumatic causes of knee effusion are injuries to ligament, bone or meniscus and overuse.