<P> Risk factors include bone fractures, joint dislocations, alcoholism, and the use of high - dose steroids . The condition may also occur without any clear reason . The most commonly affected bone is the femur . Other relatively common sites include the upper arm bone, knee, shoulder, and ankle . Diagnosis is typically by medical imaging such as X-ray, CT scan, or MRI . Rarely biopsy may be used . </P> <P> Treatments may include medication, not walking on the affected leg, stretching, and surgery . Most of the time surgery is eventually required and may include core decompression, osteotomy, bone grafts, or joint replacement . About 15,000 cases occur per year in the United States . People 30 to 50 years old are most commonly affected . Males are more commonly affected than females . </P> <P> In many cases there is pain and discomfort in a joint which increases over time . While it can affect any bone, about half of cases show multiple sites of damage . Avascular necrosis primarily affects the joints at the shoulder, knee, and hip . The classical sites are: head of femur, neck of talus and waist of the scaphoid . </P> <P> Avascular necrosis most commonly affects the ends of long bones such as the femur (the bone extending from the knee joint to the hip joint). Other common sites include the humerus (the bone of the upper arm), knees, shoulders, ankles and the jaw . </P>

Icd 10 code for avascular necrosis right hip