CAVALLINI JAMES / BSIP / SCIENCE PHOTO LIBRARY CAVALLINI JAMES / BSIP / SCIENCE PHOTO LIBRARY
Bone death. Sagittal magnetic resonance imaging (MRI) scan of the knee of a patient with osteonecrosis (bone death, dark blue area down centre right) in the femur (thigh bone). The bone death results from a loss of blood flow to the area, known as an infarction. Osteonecrosis causes causes pain and swelling. Treatment is with pain relief and exercise. In severe cases, surgery may be needed to remove the dead tissue or replace the joint.
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