Fig. 5

A typical case to regulate the PSA and anteversion angle to obtain ideal TAD. a-b, preoperative anteroposterior (a) and lateral (b) X-ray to diagnose intertaochanteric fractures; c-f, the adjustment of the guide pin. When position of neck guide pin is lower (the PSA is less, c) than normal and anteversion angle of the nail is more than normal (d), we need to partially extract the nail and internally rotate it to make anteversion angle less (f) (at the same time, the PSA will decrease in AP view, e) to get better TAD; g-h, postoperative anteroposterior (g) and lateral (h) X-ray to confirm the fracture reduction. Green line, nail position; red line, current position; yellow, ideal position