HYBRID TOTAL HIP-ARTHROPLASTY IN PATIENTS UNDER THE AGE OF 50 - A 5 TO 10-YEAR FOLLOW-UP

In 37 patients, 45 total hip replacements were performed using contemp orary cementing techniques, an uncemented Harris-Galante I acetabular component and a cemented precoated Iowa femoral component in patients under the age of 50 at the time of their surgery; 36 patients with 43 :hybrid flips were living, 1 patient with 2 hybrid hips was decreased. No patients were lost to follow-up. At 5- to 10-year follow-up, eight hips were revised for aseptic loosening. No acetabular components, an d eight femoral components (18%) were revised for aseptic loosening. W hen looking at radiographic results, including revision as well as tho se components that were probably or definitely loose on radiographs, 0 acetabular components and 11 femoral components (24%) were radiograph ically loose. These results demonstrate the excellent durability of th e uncemented Harris-Galante acetabular component in the younger patien t. However, the Iowa grit-blasted methyl methacrylate precoated femora l component had a magnitude increase in the prevalence of revision for aseptic femoral loosening when compared to the senior author's long-t erm Charnley results in this age group. The authors attribute the fail ure to the rough surface finish applied to the femoral component. Howe ver, the polymethyl methacrylate proximal precoating and the femoral c omponent design may also contribute to the femoral failures.