Published: Jan 2003
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The MS-30 femoral stem is a three-dimensionally tapered, collarless implant for cement fixation in THR, manufactured from an FeCrNiMnMoNb-alloy with either a matte or polished surface. One hundred twenty-seven MS-30 stems with matte surface and 128 stems with polished surface, respectively, were implanted in an alternated manner.
The mean observation period was 5.6 years. No patients were lost to the followup. In both groups 88 patients with 108 stems were included in the clinical and radiographic follow-up examinations. Only one stem with a matte surface was revised for aseptic loosening. There was no death related to surgery and no infection.
Conclusion: Both, the clinical and radiographic evaluation (radiolucencies, osteolyses and subsidence) did not show any statistically significant difference between the two groups.
The main reason for the equally excellent performance of both the matte and the polished version of the MS-30 stem may be the design of the centralizer which resists both debonding of the stem, and subsequent subsidence as a precondition for fretting in the metal/cement interface.
Clinical relevance: Since, on the one hand, debonding of the stem/cement interface cannot entirely be excluded, we recommend the discontinuation of tapered stems with a matte surface — especially if they do not have a centralizer which resists the stem to subside.
Total Hip Replacement, Cement Fixation, Tapered Stem, Implant Surface
MD, University of Basel, Basel,
Private Dozent, MD, University of Basel, Basel,
Professor em., MD, University of Basel, Basel,