Twenty-eight cases of fracture of the femur and tibia on the same leg were treated in Pusan Maryknoll Hospital during the period from April 1981 to Jun 1988. We studied all of these patients, divided by five groups according to the method of treatment, with analysis of treatment and end results. The following results were obtained. 1. The incidence of trauma was high in the young man, and most frequent in the third decade (42.9%). 2. The main cause of injuries was traffic accident; 22 patients (78.6%). 3. The common fracture site was middle one-third in femur and tibia respectively. 4. The most common associsted injury was head trauma (9 case). 5. The average healing time of fracture was 20.7 weeks in femur and 22.7 weeks in tibia of group 3, 4, 5. 6. The best results were obtained in cases both fractures stabilized surgically.