Radiograph of acetabular posterior column fracture

(A) On the anteroposterior view, the displacement of the ilioischial line (arrow) is apparent while the iliopectineal line is seen to be intact (black arrowheads). As typical, the ilioischial line (arrow) is displaced relative to the radiographic U (white arrowhead).
(B) The obturator oblique view confirms the anterior column to be intact (arrowheads) and demonstrates the fracture of the ischial ramus (arrow).
(C) The iliac oblique view shows the disruption of the greater sciatic notch and the displacement of the posterior column (arrow).
(D) The computed tomography section shows a fracture line typical of a posterior column fracture.