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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.
Some commonly experienced symptoms may include: 1  Knee pain. 2  Swelling that begins within three hours of the injury. 3  Decreased range of motion of the knee and difficulty walking.  Instability of the 1  joint. A feeling that the knee might give  way.