DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Fluid aspirated from an arthritic knee of 57 year old man with osteoarthritis. Osteoarthritis is a condition in which the joints become inflamed and damaged, which makes them painful and less mobile. Osteoarthritis causes the synovium, the tissue lining the joint, to become inflamed and produce too much synovial fluid. This fluid usually lubricates the joint, but excess production causes swelling and pain. Removal of the fluid treats the symptoms. If the condition worsens, the knee joint may have to be replaced with an artificial joint.
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