Background: This report presents the initial experience with the use of a grit-blasted, press-fit femoral prosthesis.

Methods: The first 300 consecutive primary total hip arthroplasty procedures using a collarless, three-dimensional tapered, straight, titanium alloy stem with a grit-blasted surface (performed in 299 patients) were evaluated with independent clinical and radiographic follow-up examinations up to sixteen years.

Eight different types of acetabular components, including a cementless alol-polyethylene socket in 80 percent of the cases, were used.

Radiographic evaluation, performed by an independent observer using a zonal analysis method, included assessment of component migration, Engh’s implant-bone femoral fixation score, implant-bone demarcations, and periprosthetic osteolysis.

The average duration of long-term radiographic follow-up was 12,6 years (range; 10 to 16 years).

Results: At last examination only five hips were lost to follow-up and 69 patients were deceased.The overall mechanical failure rate (i.e. unsteble with or without revision) of the femoral component was 2 percent.

The femoral revision rate was 7 percent 8two hips for asepticloosening, five hips for septic loosening, and twelve hips with osseointegrated stems for severe progressive femoral osteolysis) and the acetabular.

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GAP II è un sistema per l’archiviazione di dati clinici e chirurgici di pazienti sottoposti ad interventi di chirurgia protesica di anca, ginocchio e spalla.