The incidence of intertrochanteric fracture of the femur in the elderly patient has been increased progresslvely due to the prolongation of Korean average life span and improvement of the medical survice. The mortality. however, in these elderly patients is relatively high. Rigid internal fixation of intertrochanteric fracture with early mobilization of the patient has in recent years reduced the mortality and morbidity. From September 1984 to August 1991, the authors had treated with Ender nails for 126 cases of intertrochanteric fracture. From 109 cases followed more than six months, the clincal results were as follows. 1. The average age was 74.8 years. 2. 73 cases (67%) were unstable fractures and 36 cases (33%) were stable fractures by Evans classification. The most common type was type 3 (35.8%) by the Tronzo classification, A2 type(55.1%) by the AO classification. 3. The main indication were stable fracture, unstable fracture over 70 years old, high anesthe tic resk, severe osteoporosis and wound at greater trochanter. 4. Intraoperatlve complications were experienced in 37 cases(33.9%). The improper entry hole site was most common. 5. Postoperative complications occured in 57 cases(52.3%) and more frequently in unstable fractures(57.5%). The most common complication was knee joint pain in 45 cases (41.3%) 6. Recently, patients who had Ender nails with Knowles pins showed good results in the presence of severe osteoporosis or unstable fracture.