PMC4891592_01
Anteroposterior radiograph of the pelvis demonstrates a bipolar hip arthroplasty, with a cemented femoral stem. The acetabular cup component of the arthroplasty has dissociated from the femoral component and is dislocated inferomedially. The head of the femoral component now lies directly within the native acetabulum. [Powerpoint Slide]
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Initial right hip radiographs demonstrated dissociation of the components of the bipolar hemiarthroplasty, with inferomedial displacement of the acetabular cup component, and with the prosthetic femoral head abutting the roof of the acetabulum (Figure 1).