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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.
These symptoms are sometimes noticed before the symptoms of pain. Joint effusion of the knee is the most common symptom of osteoarthritis. There may be a formation of bunion at the toes which makes them red and swollen.