Bipolar Arthroplasty with Acetabulopasty for the Treatment of Dysplastic Coxathroses. Radiological Evaluations of the Acetabular Side.

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Bipolar arthroplasty with acetabuloplasty was performed on 63 hips with marked dysplasia. Radiological evaluation of the acetabulum was done by measurement of Sharp's angle and the Acetabular-Head index (AHI) before and after operation, and migration of the outer-head component was discussed. Pre-operatively. Sharp's angle was on av. 49.3° and the AHI 44.1%. After reaming the acetabulum, they were on av. 53.9° and 53.4%, respectively.Migration of the outer-head was recognized in 46.8% of the cases more than one-year past the postoperative time in which the heads migrated beyond the critical level (5mm superiorly, 2mm laterally or medially) were superiorly in 10 heads, laterally in 8 and medially in 5. Although there were no statistical correlations between migration and Sharp's angle or the AHI, a tendency to migrate superiorly was observed in those cases with a steep acetabulum (Sharp's angle>50°) and a marked deficiency of the head-covering (AHI<50%). Generally, migration of the outer-head does not influence the clinical results, but one case is still pending revision surgery as there is a yearly decrease in its clinical score caused by a marked superomedial migration.