PRIMARY CEMENTLESS HIP-ARTHROPLASTY WITH A TITANIUM PLASMA-SPRAYED PROSTHESIS

One hundred two patients underwent 105 primary uncemented total hip ar throplasties and were reviewed at a minimum of 5 years after operation (mean, 6.1 years). The components were titanium alloy with a titanium plasma spray coating, The acetabular revision rate was 11.4%, Acetabu lar cavitary lytic lesions were identified in 25.5% at 5 years, All ac etabular revisions were performed for a combination of wear and osteol ysis, One femoral revision was performed to facilitate an acetabular r evision, but the femoral revision rate for aseptic loosening was 0%, I n addition, no femoral components had subsided or were thought to be l oose radiographically, Thigh pain was present in 4% at 5 years, Despit e the 25.5% incidence of acetabular osteolysis, distal femoral lysis w as not seen and only 5% showed focal osteolysis in the trochanteric re gion proximal to the circumferential porous coating of the femoral com ponent. Component design features were thought to be critical to the e xcellent performance of the femoral component and to the poor performa nce of the acetabular component.