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What is avascular necrosis? Avascular necrosis is a disease that results from the temporary or permanent loss of blood supply to the bone. When blood supply is cut off, the bone tissue dies and the bone collapses. If avascular necrosis happens near a joint, the joint surface may collapse. This condition may happen in any bone.
Avascular necrosis is bone death that occurs when the blood supply to the bones is decreased or stopped.Without an adequate blood supply, the bone breaks down and dies and collapses. If the bone affected is near a joint, the joint may also collapse.Although any bone can be affected, avascular necrosis most often affects ends of the long bones, such as the upper leg bone at the hip.Avascular necrosis is also called osteonecrosis, aseptic necrosis, or ischemic bone necrosis.f the bone affected is near a joint, the joint may also collapse. Although any bone can be affected, avascular necrosis most often affects ends of the long bones, such as the upper leg bone at the hip. Avascular necrosis is also called osteonecrosis, aseptic necrosis, or ischemic bone necrosis.