ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Arthritis of the hip. Coloured frontal X-ray of the left hip of a 67-year-old man with osteoarthritis affecting the joint. The spacing between the femoral head and the hip socket (acetabulum) has almost worn away completely. Osteoarthritis is a joint disease aggravated by mechanical stress. Symptoms include joint pain, stiffness and swelling.
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