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Osteonecrosis, also referred to as avascular necrosis, atraumatic necrosis, ischemic necrosis, or aseptic necrosis, is a musculoskeletal condition in which death of bone occurs. It most often affects weight-bearing joints with poor access to blood flow. Consequently, the most common areas of occurrence are the hip followed by the knee, shoulder, and ankle. In 1925, Haenisch first described a case of osteonecrosis in an adult patient who suffered ischemic necrosis of the femoral head. 1 Since then, the knowledge regarding hip osteonecrosis has substantially improved. The disease prevalence is 10,000 to 20,000 new cases per year. Hip osteonecrosis can affect patients of any age. However, patients living in their third decade are especially prone to the disease. 2 If untreated, approximately 80% of affected hips will progress and eventually develop painful osteoarthritis and …