Transverse acetabular fracture

(A) The anteroposterior pelvis view demonstrates disruption of four of the six radiograph landmarks of the acetabulum with the ilioischial line maintaining its normal relationship with the radiographic U (arrow), indicating that this is a transverse fracture below the level of the roof. Note the subluxation of the femoral head away from the intact portion of the acetabular roof.
(B) The obturator oblique view shows a break in the iliopectineal line (arrow) and subluxation of the femoral head with the displacement of the ischiopubic segment and verifies that the ischial ramus is not broken.
(C) The iliac oblique shows where the transverse fracture exits the greater sciatic notch (arrow) and again confirms the subluxation of the femoral head.
(D) This computed tomography section shows the orientation typical of a transverse fracture.