The techniques of reduction and subsequent stable internal fixation of supracondylar fractures of the femur pose many problems. At times, reduction and subsequent internal fixation may be so difficult that it would tax the surgical judgement and technical expertise of the most skilled surgeon to the limit. In treatment of supracondylar fractures, the most common errors responsible for failure were technical. And because of the difficulties encountered with the insertion of the condylar plate, we have developed a simple and more reliable way to provide confirmation of the correctness of the insertion. We began this examination by obtaining antero-posterior, lateral roentgenograms of 60 knees with a 72 inch distance and we also performed CT scanning of the femoral condyle, and then we measured the condylar valgus angle, patellofemoral inclination and the distances between the adductor tubercle of the medial femoral condyle to the tip of the 3rd guide pin. As a result, the condylar valgus angle was 8.2±1.7degrees and patellofemoral inclination 7.5±2.8 degrees. The location of the tip of the 3rd guide pin was 2.6±0.4 cm distal and 2.0±0.4 cm anterior to the adductor tubercle. In summary, we recommend a more advanced technique for proper positioning of the condylar blade plate. The 3rd guide pin has to be 7 to 9 degrees valgus and 5 to 10 degrees posterior on insertion at the entry point. We can confirm the correctness of the precise location of the 3rd guide pin on the medial aspect of the knee. The tip of the 3rd guide pin is 2cm distal and 2 cm anterior to the adductor tubercle of the medial femoral condyle.