FAILURE OF AUSTIN MOORE HEMIARTHROPLASTY: IS FEMORAL MORPHOLOGY A RISK FACTOR?
AO Odumala; MI Iqbal; and RG Middleton Royal Glamorgan Hospital, Department of Orthopaedics, Ynys Maerdy, Llantrisant CF72 8XR The aim of our study was to determine if the canal flare index of the proximal femur is a dependent factor in prosthetic failure after Austin Moore hemiarthroplasty. We measured the canal flare index on A-P hip X-rays of 100 and 100 patients with failed and successful Austin Moore hemiarthroplasty respectively. We also measured the canal flare index of a control group of 100 patients without hip fractures. The canal flare index (CFI) is defined as the ratio of the width of the femoral canal at two levels: 20mm proximal to the centre of the lesser trochanter and the canal isthmus. Overall we reviewed 300 radiographs. The study group consisted of 68 males and 232 females. In the failed Austin Moore group there were 62 patients (62%) with loosening, 28 patients (28%) with dislocations and 10 patients (10%) with periprosthetic fractures. The canal flare index of th
