Does the self-centering mechanism of bipolar hip endoprosthesis really work in vivo?

Journal of Orthopaedic Surgery | April 1, 2005| | Copyright

ABSTRACT

Purposes. To examine radiographically the component motion in a bipolar prosthesis and to determine whether the self-centering mechanism really works in vivo.

Methods. 38 patients with 41 bipolar hip endoprostheses (30 for coxarthrosis and 11 for osteonecrosis of femoral head) were included in this study. Two radiographs of each case were taken to evaluate the self-centering mechanism. The first anteroposterior radiograph of both hip joints was taken at the maximum abduction while the patient standing on the endoprosthetic leg. The second radiograph was taken after the patient ...

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