REVISION TOTAL HIP-ARTHROPLASTY USING A CEMENTLESS ACETABULAR COMPONENT - TECHNIQUE AND RESULTS

Are the midterm results (range, 7-11 years) for revision of the acetab ulum with a cementless hemispherical component comparable with other p ublished revision techniques at similar followup? One hundred thirty-e ight acetabular revisions for aseptic loosening were done in 132 patie nts using a cementless hemispherical component coated with titanium me sh and inserted with supplemental screw fixation. Twelve patients died , 9 were lost to followup, and 6 could not return for followup, leavin g 111 patients (115 hips) with a mean of 100 months of followup. Thirt een hips required revision (11%): 4 were done for recurrent dislocatio ns, and 6 for sepsis; 3 stable cups were revised (at the time of stem revision). No cup was revised for aseptic loosening. Radiographic revi ew was available for 105 patients (109 hips) at mean 98-month followup (78-135 months). A complete radiolucency was seen in 4% of the cups, a partial progressive radiolucency in 3%, and a partial nonprogressive radiolucency in 54%; no radiolucency was present in 39%. A screw radi olucency was seen in 2%, and osteolysis at the cup margin in 4%. Revis ion of the acetabulum with a cementless porous-coated hemispherical fi ber-metal component is superior to the results reported for acetabular revisions with cement at similar followup.