The purpose of this paper is to report the technical problems, indications and contraindications of treatment by interlocked intramedullary nail in supracondylar fracture of the femur. The authors analyzed 5 cases of femoral supracondylar fractures in patients who were treated by interlocked intramedullary nailing. All 5 cases treated with interlocked intramedullary nail were obtained primary bone union. According to Neer's criteria, excellent result was achieved in 1 patient, satisfactory and unsatisfactory results in 2 patients, respectively. In conclusion, we consider that interlocked intramedullary nail fit as follows; 1. Type A of AO classification. 2. In case of more proximally located fracture. 3. Supracondylar fracture of the femur with severe communited fracture of the ipsilateral femora diaphyses.but unfit as follows; 1) Supracondylar fracture of the femur with severe osteoporosis. 2) In case of more distally located fracture. 3) Type C of AO classification.