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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.
Symptoms may include; visible swelling or protrusion on the back of the knee (which can be painful or painless), constant and prolonged knee pain, and tightness at the back of the knee or simply a feeling of tenderness at the back of the knee.