Intertrochanteric fractures of femur were increasing in their incidence in morden life. The compression hip screw and Ender nail are popular treatment modalities of the interochanteric fracture of femur. We had tried to clarify the complications of intertrochanteric fracture according to the treatment modality-compression hip screw and Ender nail. We obtained the results as followings with the patients who had intertrochanteric fracture of femur which were managed by compression hip screw (56 cases) and Ender nail (22 cases) through the period of March 1987 to June 1993. The summary of the results; 1. Mechanical complications were developed in 9 patients(16%), 9 complications in the group with compression hip screw and 7 patients(32%), 12 complications in Ender nail. 2. Local complications were developed in 4 patients(7%) in compression hip screw and 10 patients (46%) in Ender nail and the most common local complication was the knee joint pain(7 patients; 32%). 3. Statistically, more significant decrease of neck-shaft angle was shown with group using Ender nail for unstable fracture than stable fracture group and compression hip screw group. 4. The degree of shortening was incrased in group with Ender nail than in group with compression hip screw, but there was no statistical significance. 5. The grade of osteoporosis was not related to the change of neck-shaft angle and shortening and also to the development of mechanical complication. According to the above results, compression hip screw was a more stable fixation device than Ender nail in the unstable intertrochanteric fracutre.