ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Coloured X-ray (front view) of the pelvis in a 45 year old female patient showing osteoarthritis of the sacroiliac joint (at upper left). The sacroiliac joint occurs where the sacrum of the spine (upper centre) joins the pelvis and here bone erosion is seen. Osteoarthritis is a joint disease due to mechanical damage.
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