Fig. 6From: The placement of percutaneous retrograde acetabular posterior column screw based on imaging anatomical study of acetabular posterior column corridorCross sections of easy-to-penetrate sites. 1A and 1B: Posterior acetabular wall is easy-to-penetrate at 4th layer of cross section; 2A and 2B: Acetabulum is easy-to-penetrate at 7th layer in males or at 8th layer in females; 3A and 3B: Quadrilateral plate is easy-to-penetrate at 12th layer of cross sectionBack to article page