Grit-Blasted Titanium Femoral Stem in Cementless Primary Total Hip Arthroplasty A 5- to 10-Year Multicenter Study

Abstract: A total of 133 cementless primary total hip arthroplasties using the Zweymuller-Alloclassic grit-blasted titanium tapered stem were performed in 3 institutions. The patient cohort was divided into 2 subgroups, nonselected and selected, on the basis of excellent bone stock and age (,65 years old at surgery). Acetabular components were all cementless, and bearing surfaces were all alumina-ceramic on polyethylene. After a 7.3-year average follow-up period (range, 5–10 years), 118 primary femoral replacements in 109 patients could be reviewed fully. Mean age at surgery was 55.7 years (range, 27–84 years). According to the Merle d’Aubigne and Charnley rating system, clinical results were graded excellent and good in 89 % of hips and fair in 11%. Radiologically, early subsidence.2 mm could be detected in 4 hips (3.4%). Calcar atrophy and spot welds were noted in 77 % and 82 % of hips. Femoral osteolysis granuloma was noted in 4 hips (3.4%). There has been no stem fracture and no ceramic head breakage. The survivorship at 10 years with definite femoral aseptic loosening (radiographic failure) as the endpoint was 100 % (95 % Wilson confidence interval, 78.4%–100%; worst scenario, 95.4%).