Metal-on-metal
hip resurfacing arthroplasty was introduced to preserve patients’ bone and
facilitate revision surgery. This prospective cohort study aims to determine a
prognostic model (OsBHR) to predict which patient
and surgeon related factors predict better long term implant survival for the
Birmingham Hip Resurfacing (BHR).
Between 1997 and
2002, details of 4490 patients (4945 hips) treated by hip resurfacing
arthroplasty using the BHR prosthesis were entered in a prospective
international registry and available for analysis. Implant survival was
determined using the Kaplan-Meier estimator and a shared frailty proportional
hazard model was used to determine predictors of implant revision.
prognostic
equation suggested a minimum diameter of 50 mm should be used for male and 52
mm for female patients to ensure a minimum 10-year survival rate of 95% for in
procedures performed by an average surgeon.
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