Fig. 6

 A: Mendel et al. [27] used the anterior edge of the spinal canal as the nail entry point with an angle of 12°; B: Hou et al. [28] used an anterior tilt angle of 38°; C: preoperative nail entry point angle of 35° with the posterior edge of the spinal canal; D: postoperative nail entry point angle of 32° with the posterior edge of the spinal canal; E: 3D CT reconstruction confirmed the location of the nail entry point at the intersection of the line connecting the anterior superior iliac spine and posterior inferior iliac spine with the upward extension of the femoral stem