Radiographic appearance of T-shaped acetabular fracture

(A) The appearance on the anteroposterior pelvis radiograph may be distinguished from the transverse fracture by the presence of the fracture of the ischial ramus (arrow). Displacement of the stem of the T may cause the ilioischial line to appear duplicated (small arrowheads). Likewise, the relationship between the ilioischial line, which remains with the posterior column, and the teardrop, which remains with the anterior column, may be disrupted (large arrowhead).
(B) The obturator oblique shows the break in the iliopectineal line (dashed arrow). It also allows better visualization of the stem of the T (short arrow) as it enters the roof of the obturator foramen and is associated with the ischial ramus fracture (thick arrow).
(C) The iliac oblique view demonstrates the disruption of the greater sciatic notch and subluxation of the femoral head.