Avascular necrosis is characterized by osseous cell death due to vascular compromise [1]. Avascular necrosis of bone results generally from corticosteroid use, trauma, pancreatitis, alcoholism, radiation, sickle cell disease, infiltrative diseases (e.g. Gaucher’s disease), and Caisson disease [1,2]. The most commonly affected site is the femoral head and patients usually present with hip and referred knee pain.