Avascular necrosis of the femoral heads after single corticosteroid injection

Description: This patient had minimal tenderness over his hips, with mild limitation to his range of motion. Both hips had cystic changes in the femoral heads without collapse (Fig. 1). He had been treated 8 months previously with a single intramuscular dose of betamethasone (dose equivalent to 75.5 mg prednisolone) for an allergic condition. Izge Gunal and Vasfi Karatosun CMAJ • July 4, 2006; 175 (1).