Cementless Acetabular Reconstruction for Arthropathy in Old Acetabular Fractures.

Abstract

This study was conducted to identify the factors influencing mechanical failure of cementless acetabular reconstruction for arthropathy after operative treatment of acetabular fractures. Fifty-six patients (56 hips) undergoing cementless total hip arthroplasty were enrolled and followed for a mean of 120 months (range, 60-180 months). The 10-year survival rate, with mechanical failure (radiographic loosening or revision due to aseptic loosening) as the endpoint, was analyzed with respect to sex, age, body mass index (BMI), acetabular bone deficiency, sclerotic changes to the acetabulum, and use of the Trabecular Metal (TM) cup (Zimmer, Inc, Warsaw, Indiana). Mean 10-year survival rates of the acetabular component were as follows: 80% (range, 65%-96%) in males and 100% in females (P=.032); 77% (range, 60%-95%) in patients younger than 50 years and 91% (range, 82%-100%) in older patients (P=.027); 88% (range, 78%-98%) in patients with a BMI less than 30 kg/m(2) and 81% (range, 74%-89%) in patients with a BMI of 30 kg/m(2) or higher (P=.068); 54% (range, 32%-76%) in patients manifesting large acetabular deficiency and 90% (range, 78%-100%) in the remaining patients (P<.001); 78% (range, 65%-91%) in patients with the presence of sclerotic acetabulum and 92% (range, 86%-100%) in patients with the absence of sclerotic acetabulum (P=.022); and 82% (range, 73%-100%) in patients who received a conventional shell and 100% in patients who received the TM cup (P=.039). Male sex, age younger than 50 years, large acetabular deficiency, and sclerotic changes of the acetabulum were significant factors contributing to the mechanical failure of cementless acetabular reconstruction performed for old acetabular fractures treated with open reduction and internal fixation. Use of the TM cup seemed able to prolong the endurance of the acetabular component in the subsequent reconstruction.