Article
A 10–18 years follow up of the uncemented isoelastic monoblock RM acetabular component in young patients
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Published: | October 21, 2010 |
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Objective: The purpose of this retrospective cohort study was to evaluate the long-term clinical and radiological survival of the uncemented isoelastic RM cup in high demand patients under 50 years.
Methods: During the period of 1990 and 1997 a cohort of 158 total hip arthroplasties were performed in our institution on 131 patients. The mean age was 42.4 years (range 16-50 years); 67 were female and 64 were male. The mean follow up period was 13.2 years ( range 10–18 years). Clinical and radiological analysis was performed using standard pelvic radiographs and questionnaires.
Results and conclusions: During follow up twenty-two patients underwent acetabular revision mainly due to acetabular wear. The mean wear rate was 0.11 mm/year (0–0.68) and was significantly higher in components with a metal on polyethylene articulation. Progressive significant acetabular osteolysis was seen in 4 patients (3%). Kaplan-Meier survival curves at 10 and 14 years showed survival of 98% (95% CI 95–100) and 80% (95% CI 72–89) for revision for any cause and 98% (95% CI 96–100) for aseptic loosening.