The ideal timing for a Total Hip Arthroplasty (THA) remains a highly controversial topic in the treatment of displaced acetabular fractures in the elderly with damage to the articular surface of the acetabulum or femoral head. Acute THA offers early rehabilitation but a high incidence of heterotopic ossification has been reported. Its incidence and consequences on the patient's function are not clear. The goal of this study is to compare the incidence of heterotopic ossification following acute THA of acetabular fractures compared to delayed THA, and to evaluate its functional effects on the patient. In this retrospective consecutive case series of acetabular fractures; 20 patients were treated with acute THA and 20 patients were treated with delayed THA after failed conservative or surgical treatment. The incidence of heterotopic ossification (using Brooker's classification) was obtained and functional outcomes were evaluated using SF-12, WOMAC, Harris Hip Score surveys.Purpose
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