The porous-coated anatomic total hip prosthesis

Of 137 consecutive primary porous-coated anatomic (PCA) arthroplasties performed, complete data was available on 107 hips in 93 patients at an average of 12.4 years (range, 11–13 years). The average Harris Hip Score improved from 44 to 85 at final follow-up, with 78% good or excellent result. Thirteen percent (14 of 107) of acetabular components and 4 porous ingrowth stems were deemed failures. Osteolytic lesions were seen in 7.5% (8 of 107) of acetabular components. Survivorship of the PCA prosthesis as a whole was 83% at 12.4 years. This first-generation femoral stem performed well, with only 4 failures, all of which occurred in patients with avascular necrosis in which unrecognized pathologic changes in the proximal femur may have inhibited bone ingrowth. The majority of the failures can be attributed to aseptic loosening of the acetabular component.