Metal-on-metal total hip joint replacement: a minimum follow-up of five years

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ABSTRACT:The search for an ideal bearing surface for hip arthroplasty is ongoing. Over 1000 metalon-metal total hip replacements have been performed at our institution since 1993. A review of 215 primary hip arthroplasties performed using Metasul® (Sulzer, Winterthur, Switzerland) metal-on-metal articulation with a minimum follow-up of five years is presented.Six patients were lost to follow-up, leaving 209 hips for review. The average follow-up was 7.33 years (range 5-11.4 years). The mean preoperative Harris Hip Score (HHS) was 39.8 and mean postoperative hip scores rose to 89.5, 87.3, 88.4 and 85.8 at 1-year, 3-year, 5-year and final follow-up respectively.Two hips were revised for acetabular loosening and none due to loosening of the femoral stem. Implant survivorship was 95.5% at 12 years. No untoward systemic effects were noted in the cohort. Metasul® metal-on-metal articulation has shown satisfactory results in the medium term with regard to osteolysis and aseptic loosening. Level of evidence: IV (Case series)

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