Acetabular posterior wall and column fractures

(A) The anteroposterior pelvis radiograph shows the disruption of the ilioischial (arrow) but not the iliopectineal lines (small arrowheads), and the ischial ramus fracture is present (large arrowhead). The posterior wall fragment can be appreciated overlying the roof of the acetabulum (dashed arrow).
(B) The obturator oblique view shows the displaced posterior wall fragment (arrow), the ischial ramus fracture (small arrowhead), and the intact iliopectineal line (large arrowhead).
(C) The iliac oblique demonstrates the disruption of the greater sciatic notch and the posterior wall fragment superimposed on the roof of the acetabulum (arrow).
(D) This computed tomography section shows the posterior wall fracture (arrow) with a column fracture line typical of a posterior column fracture (small arrowheads).