Avascular Necrosis

Avascular necrosis is a disease resulting from the temporary or permanent loss of the blood supply to the bones. Without blood, the bone tissue dies and causes the bone to collapse. If the process involves the bones near a joint, it often leads to collapse of the joint surface. This disease also is known as osteonecrosis, aseptic necrosis, and ischemic bone necrosis. There are many causes of avascular necrosis such as alcoholism, excessive steroid use, post trauma and Caisson's disease. In ...