Fig. 4

Radiographic measurements performed in this study. (A) (B) The tip-apex distance is measured as the sum of the distance, in millimeters, from the tip of the lag screw to the apex of the femoral head in the anteroposterior and lateral view of the radiographs. The lateral extension distance (for screw back-up) was measured between the lateral end of the screw and lateral edge of the intramedullary nail. The gap of the cortical bone (G) was measured as the maximum value of the gap observed in the anteroposterior or lateral view