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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 of a Baker's cyst. Often there are no symptoms and the cyst can remain unnoticed. If symptoms do occur, they can include: a pronounced soft lump or swelling on the back of the knee that looks most obvious when the person is standing. a sensation of pressure in the back of the knee joint. persistent pain or aching.