Fig. 4.

a Less severe C fracture, 3D AP image (A₁) shows left central hip dislocation. Interior lateral (IL) view (A₂) shows a triangular shaped fragment of broken Q surface or acetabular floor. b Moderate severe C fracture (B₁) 3D AP image and IL view (B₂) show a moderate severe injury by the extension of the primary vertical fracture line. c Most severe C fracture (C₁) 3D AP image and IL view (C₂) show severe impaction by the aggressive extension of primary and secondary fracture lines breaking through columns