A body builder taking steroids and creatinine presented with hip pain and unable to squat. On MRI, femoral aicular surface is disrupted and there is cresent sign seen on radiograph. What is the diagnosis?

History of intake of steroids usually results in avascular necrosis. The classic appearance of a thin subchondral fracture line known as "Crescent sign". It is seen on X -ray signifies Avascular necrosis. Most common location of AVN is Head of Femur which is called Chandelier's sign.