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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 of the comorbid or associated medical symptoms for Sports related knee injuries may include these symptoms: 1  Acute shoulder pain on one side. 2  Arthritis-like symptoms. 3  Chronic elbow pain. 4  Chronic shoulder pain on one side. 5  Constant collarbone pain. 6  Constant shoulder pain. 7  more associated symptoms...Â».