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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 (which is different from osteopenia or osteoporosis, caused be loss of bone minerals) occurs when blood vessels that supply the bone constrict, cutting off blood supply and causing bone death. Avascular necrosis, also known as osteonecrosis, can happen in any bone.