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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 can be defined as the death of bone due to a lack of adequate blood flow. When this occurs in the hip it is usually in the ball of the joint, called the femoral head. It causes a dull ache or throbbing in the hip, groin or buttock and pain when walking or moving the hips from side to side.