In this in vitro model using 'bone substitute', less conforming glenoid components allowed greater translation, greater rim loading and greater interface micromotion that more conforming glenoid components.
The clinical relevance of this study is unclear, in that there are a number of pros and cons for different surface geometries. Totally conforming glenohumeral relationships offer greater initial stability through the concavity compression mechanism, but this comes at the expense of limited motion and increase loads on the polyethylene at the constraining rim and increased loads on the component fixation with even minor degrees of translation. Increased degrees of mismatch provide less stability, the possibility of greater translation with eccentric loading of the component, but also may allow greater glenohumeral motion and less interface loads with minor translations.
The interested reader may wish to revisit previous posts on surface mismatch, concavity compression, rocking horse, and glenoid component (see labels at right).
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