What causes avascular necrosis (osteonecrosis)?
An injury, such as a forceful impact in an auto accident, or a complication of a hip fracture or dislocation can lead to avascular necrosis. Diseases such as sickle cell disease, gout, and lupus also may lead to avascular necrosis.
Long-term use of corticosteroids or drinking a large amount of alcohol over a long time increases the risk of avascular necrosis.
