Out of 518 total shoulders from 10 European surgical centers using a third generation anatomic prosthesis, radiographic loosening was found in 32% at an average of 8.6 years after surgery (Walch G, Young AA, Boileau P, et al.: Patterns of loosening of a cemented polyethylene keeled glenoid component in primary osteoarthritis - Results of a multicenter study).
The Mayo Clinic group reported essentially identical results with a different prosthesis: in 157 total shoulder arthroplasties using a cemented Cofield II keeled all-polyethylene glenoid component, 32% of the glenoids showed radiographic failure at 10 years ( Fox TJ, Foruria A, Klika B, et al.: Radiographic survival in total shoulder arthroplasty).
A multicenter French report using a modern uncemented metal-back glenoid component found that at 12-year follow-up, approximately half of the glenoid prostheses had been revised for wear or loosening (Moineau G, Morin-Salvo N, Walch G, et al.: Long-term results of anatomical total shoulder arthroplasty with metal-backed glenoid components implanted for primary glenohumeral joint osteoarthritis).
These studies indicate the need for long term followup to determine the survivorship of the glenoid component in total shoulder arthroplasty.
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