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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.
Twisting the knee is a common cause of overstretched or torn ligaments of the knee. The knee may give out suddenly when the ACL is torn and there may be a popping sound upon injury. Symptoms of a torn ACL include knee pain, swelling, stiffness, and bruising. Walking is painful and the knee feels instable.