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Causes

The causes of avascular necrosis are not completely understood, but it appears to be related to an interruption in blood flow to the femoral ball. Here are some possible reasons:
1. Damage to the blood vessels due to fracture (e.g. broken hip)
2. Damage to the inside of the blood vessels (e.g. vasculitis, radiation therapy)
3. A clot that clogs the blood vessel (e.g. sickle cell diseases, corticosteroids, alcohol)

Although the cause in bone death is clear in some cases (such as a disruption in blood flow from a break in the bone or a clot in the blood vessels) the cause in most cases is poorly understood. People who have used large amounts of steroids or alcohol for long periods of time may have a higher risk of developing this disease.