Original ArticleComparison of conforming and nonconforming retrieved glenoid components
Section snippets
Materials and methods
From 1979 to 2006, total shoulder arthroplasty components were retrieved during revision surgery at a single hospital. The components were assigned an anonymous number and stored in the laboratory until analysis. Seventy-eight retrieved glenoid components from 73 patients were available from 4 identifiable manufacturers (52: Biomet, Warsaw, IN; 17: Neer II [Smith & Nephew, Inc. - Orthopedics, Memphis State, TN]; 6: Custom HSS [Hospital for Special Surgery, New York, NY]; and 2: Depuy
Results
Of the 63 glenoids that met the study criteria, clinical information was available for 56 (from 54 patients). For the conforming group, 27 glenoids were examined for wear damage, with clinical information available on 24. For the nononforming group, 36 were examined for damage, with clinical information available on 32.
The mean patient age was similar between the 2 groups, but the length of implantation was significantly greater in the conforming group at 5.6 ± 5.5 years, compared to only 3.1 ±
Discussion
The glenohumeral joint is an enarthrodial articulation with a hemispherical humeral head and a shallow glenoid that allows multiplanar range of motion but relies on the surrounding soft tissues to provide stability. The goal of total shoulder arthroplasty is to replicate natural motion and stability, while limiting wear and maintaining fixation of the prosthesis to the host bone.21 In the native shoulder, the humeral head may translate 1.5 mm from anterior to posterior and 1.1 mm superior to
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