If Avascular Necrosis is diagnosed early surgery may not be needed. Most people do not know taking long usage of steroids (prednisone), traumatic injury to the hip, lupus, HIV, long usage of alcohol, etc can cause Avascular Necrosis. Unfortunately my doctors couldn't find a reason why I have it. On March 11 2014 and April 24 2014 I had both of my hips totally replaced. I was taken off from work. I was denied my disability. I had to hire an attorney to try and get approve for my disablity. My doctors stated if the disease was caught in time maybe surgery could have been prevented.