A radiographic analysis of a straight-stemmed uncemented femoral component and hemispheric porous-coated acetabular component in total hip arthroplasty.

A radiographic examination of 91 uncemented hemispheric titanium alloy acetabular components and 85 straight-stemmed titanium alloy femoral components was performed. Analysis included zonal radionuclides, migration, bone changes, and fit. Correlation of these parameters were made. Acetabular radiolucencies were common in zone 3 but none were progressive; also, they were unrelated to number and position of screws. Two acetabuli were considered to demonstrate loosening. Femoral changes of calcar atrophy, distal cortical hypertrophy, and distal femoral capping were independent of bone type and distal fit. One component subsided. Proximal radiolucency occurred in three patients, all on the lateral surface. Bony changes around the prostheses were statistically not related to bone type.