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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.
A swollen knee occurs when excess fluid accumulates in or around your knee joint. Your doctor might refer to this condition as an effusion (ih-FYU-zhen) in your knee joint.Some people call this condition water on the knee.. swollen knee occurs when excess fluid accumulates in or around your knee joint. Your doctor might refer to this condition as an effusion (ih-FYU-zhen) in your knee joint.