Fig. 2

AP view of a displaced femoral neck fracture in a 55-year-old female (a). The fracture obtained smooth anatomic reduction (red arrow) according to intraoperative fluoroscopies (b, c), and the fracture changed into slightly varus (≤ 10°) 3 days postoperatively (d, e). CT showed the fracture displaced to varus (> 10°) 4 months postoperatively, which resulted in early failure as the screws cut out from the femoral head (f)