Prevalence of femoroacetabular impingement in younger patients undergoing total hip arthroplasty.

The pathogenesis of hip arthrosis is complex with many risk factors. Femoroacetabular impingement abnormalities are thought to be a factor. To determine the prevalence of femoroacetabular impingement in younger patients who had undergone hip arthroplasty, the authors reviewed preoperative radiographs to determine radiographic indices of femoroacetabular impingement in 142 patients (92 men and 50 women) younger than 50 years old and who had undergone hip replacement.