The Harris-Galante porous acetabular component at intermediate follow-up

Outcome of the acetabular component in 90 consecutive primary noncemented t otal hip arthroplasties (THAs) was prospectively studied. The acetabular cu p consisted of a hemispherical titanium alloy shell with a titanium fiber-m esh porous coating and a modular polyethylene liner (Harris-Galante Porous- 1, Zimmer, Warsaw, Ind). The cup was implanted using line-to-line reaming w ith adjunctive dome screw fixation. The femoral component consisted of a ti tanium alloy stem with titanium fiber-mesh porous coating and a 28-mm cobal t-chrome modular head. Mean patient age was 53 years (range: 27-75 years); male:female ratio was 48:42; and mean follow-up was 6 years (range: 4.5-8 y ears). One acetabular component was revised for aseptic loosening. Of 81 unrevised hips available for follow-up, mean Harris hip score was 57 preoperatively and 96 at final follow-up (72% excellent, 15% good, 13% fair, and none poor ). Of 61 unrevised hips with adequate radiographic follow-up, radiographic failure (complete periprosthetic radiolucency) was evident in 3 (4.9%) and periacetabular osteolysis in none. Radiographic failure did not correlate w ith poor clinical outcome. Linear polyethylene wear rate (mean: 0.13 mm/yea r) did not correlate with age, gender, weight, outcome, or cup abduction an gle, but did correlate with the presence of femoral periprosthetic osteolys is (0.18 mm/year with femoral osteolysis versus 0.11 mm/year without; P=.01 ). This series of porous-coated hemispherical cups demonstrated excellent inte rmediate-term clinical and radiographic outcome, comparable with similarly favorable results reported by the prosthesis designers. A potentially adver se effect of polyethylene wear on the longevity of a THA was supported by a positive correlation between polyethylene wear rate and femoral osteolysis .