avascular necrosis

Oh Thank you so very much for sending me this. My son had his surgery...a bone graft (OATS procedure) at the Seattle VA. Doctors from U of Washington performed the surgery and even brought over the needed equipment. So far it has been sucessful although my son C/O pain upon waking in the am while ambulating, the pain level often goes from a 6 to a 3 as the day goes on. He is so young to have arthritis at age 22. I as a nurse watch his condition carefully and question the doctors who my son follows up with. I would like to see evidenced based studies of patients a year after surgery to see how they are doing/coping. Again Thank you so much for this information.