REVISION OF THE ACETABULUM WITHOUT CEMENT WITH USE OF THE HARRIS-GALANTE POROUS-COATED IMPLANT - 2-YEAR TO 8-YEAR RESULTS

Sixty revision total hip arthroplasties were performed in fifty-nine p atients with use of the Harris-Galante-1 porous-coated acetabular comp onent. The patients were followed prospectively for a mean of five yea rs (range, two to eight years). Multiple small screws were used for fi xation of the component in all of the hips. Bulk allograft or cancello us bone graft was placed in forty-eight hips. The hips were evaluated clinically with use of the Harris hip-scoring system. A component was considered to be loose if there was a change in the cup angle of more than 5 degrees or vertical or horizontal migration of more than two mi llimeters, as demonstrated on serial radiographs. Forty-eight (80 per cent) of the sixty hips had a score of good or excellent at the time o f the most recent follow-up. No component had radiographic evidence of loosening, and there were no broken screws or radiolucent lines aroun d the screws, Osteolysis of the pelvis was not seen in any patient. On e hip was debrided because of a late metastatic deep infection, but th e components were not removed. At the time of writing, no acetabular c omponent had been revised and no revisions were pending. There were no complications related to the use of multiple small screws, even in th e acetabula in which there was a severe deficiency of bone. The result s of the present study confirm the success of revision of the acetabul um with use of a porous-coated hemispherical component stabilized with multiple small screws, cancellous bone grafts to fill cavitary defect s, and bulk grafts to help obtain initial stability of the component.