Osteonecrosis of the femoral head associated with pregnancy

A 31-year-old pregnant woman suddenly complained of bilateral hip pain 2 we eks before delivery. She was delivered of triplets by Caesarean section. Sh e had been treated with human menopausal gonadotropin and human chorionic g onadotropin (hMG-hCC) before pregnancy. Radiograms of the hip joint showed collapse of the femoral heads bilaterally. Magnetic resonance imaging revea led a band pattern of low signal intensity for both hips on T1- and T2-weig hted images. She had no history of steroid therapy or alcohol abuse. Osteon ecrosis of the femoral heads bilaterally associated with pregnancy was conf irmed. Pathology of the femoral head showed typical empty lacunae and necro sis of the trabecula.