ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Knee disease. X-ray of the right knee of an 18 year old patient with osteochondritis dissecans (OCD) of the knee. A small piece of bone and cartilage has separated from the rear of the patella (knee cap, upper left). The separated pieces may stay in place or fall into the joint. OCD causes pain and swelling and, if the bone has moved, locking of the joint.
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