Fig. 5From: The placement of percutaneous retrograde acetabular posterior column screw based on imaging anatomical study of acetabular posterior column corridorMorphological characteristics of different cross sections. ① Cross section of ischial tuberosity; ② Cross section between the transition of the ischial tuberosity and the inferior of acetabulum; ③ Cross section between the inferior of acetabulum and greater sciatic notch; ④ Cross section between greater sciatic notch and exit pointBack to article page