Radiograph and CT of total hip arthroplasty displacement

Total hip arthroplasty displacement and acetabular fracture. Right hip radiograph AP view (A) shows that the femoral head (asterisk) and the acetabular cup (delta) of the prosthesis have migrated cranially relative to the acetabulum (arrowhead). A superior acetabular fracture is also seen (arrow). CT axial (B), coronal reconstruction (C) and sagittal reconstruction (D) images of the right hip shows the relationship of the dislocated femoral head (asterisk) and acetabular cup (delta) and relative to the empty acetabulum (arrowhead). Fractures of the superior and inferior acetabulum (arrows) are also noted.