The authors clinically analyzed 53 cases of patients beyond 18 years of age with closed solitary femoral diaphyseal fractures, and 24 cases of patients with multiple long bone fractures including closed femoral diaphyseal fracture. All theses 77 cases were followed for more than 1 year, during 1988. 1 - 1992. 12. The two groups were compared. The results were assessed by age and sex distribution, cause of the femoral fracture, type of the femoral fracture, method of treatment, timing of fixation, bone graft, union period. The results obtained were as follows. 1. The types of fracures were closed simple fractures in 34 cases of solitary femoral diaphyseal fracures, 13 cases of multiple long bone fractures, and closed comminuted fracture in 19 cases of solitary femoral diaphyseal fractures, 11 cases of multiple long bone fractures. 2. The methods of treatment were open reduction and internal fixation with plate & screws in 32 cases of solitary fractures, 18 cases of multiple fractures, closed intreamedullary nailing in 15 cases of solitary fractures, 3 cases of multiple fractures, and open intramedullary nailing & bone graft in 6 cases of solitary fractures, 3 cases of multiple fractures. 3. The average interval from injury to operation was 10 days in solitary fractures group, and 20 days in multiple fractures group. 4. Bone graft was performed simultaneously in 24 cases of solitary fractures, and 18 cases of multiple fractures. 5. The average uinon period was 14.1 weeks in solitary fractures group and 16.4 weeks in multiple fractures group.