Avascular necrosis is a rare condition associated with Behcet's disease. We report one patient with Behcet's disease who developed osteonecrosis in his distal femur. The patient was a 41 year-old man who had been diagnosed with Behcet's disease at the age of 29; he had not received corticosteroid therapy. Drilling of the distal femur was performed using arthroscopy and fluoroscopy. At present, two years after the operation, he has almost no significant complaint in his knee.
