Fig. 1

The triangular carina structure of the femoral neck and the composition of the DCLS system. A: The shortest distance between the upper and lower diameter of the femoral neck; B: The shortest distance between the anterior and posterior diameter of the femoral neck; C: The structure of the triangular carina and the position of the screws in the anatomical specimen (cited from our previous paper [10]); D: CT scan specimen showing cross-section of the minimum upper and lower diameter of the femoral neck; E: CT scan specimen showing the cross-section of the shortest distance of the anteroposterior diameter of the femoral neck; F and G: Components of the DCLS system (cited from our previous paper [10]); H: D + E cross-sections overlap to form a shared cross section of the femoral neck (saffron yellow area), triangular carina structure and screws placement (black circle)