Abstract
BackgroundUse of a baseplate with a smaller diameter in reverse shoulder arthroplasty is increasing, especially in patients with a small glenoid or glenoid wear. However, the effect of a smaller baseplate on stability of the glenoid component has not been evaluated. Thus, the purpose of this study was to determine whether a smaller baseplate (25 mm) is beneficial to the initial stability of the glenoid component compared to that with a baseplate of a commonly used size (29 mm).MethodsMicromotion of glenoid components attached to 14 scapulae of fresh-frozen cadavers was measured and compared between 25- and 29-mm baseplates in biomechanical testing. Impingement-free range of motion in abduction, adduction, internal rotation, and external rotation was evaluated by using a simulated computer model constructed based on the same fresh-frozen cadavers used in biomechanical testing.ResultsMicromotion at the inferior third of the glenoid-glenosphere interface was higher in the 29-mm baseplate group than in the 25-mm baseplate group during both 0.7- and 1-body weight cyclic loading in biomechanical testing. Adduction deficit was smaller, and total impingement-free range of motion from abduction to adduction and rotation were greater in the 25-mm baseplate group than in the 29-mm baseplate group in the simulated computer model.ConclusionsUse of a baseplate with a smaller diameter (25 mm) in reverse shoulder arthroplasty is suitable for improving the primary stability of the glenoid component. With a smaller baseplate, impingement-free range of motion is optimized in a smaller glenoid.Electronic supplementary materialThe online version of this article (doi:10.1186/1471-2474-15-417) contains supplementary material, which is available to authorized users.
Highlights
Use of a baseplate with a smaller diameter in reverse shoulder arthroplasty is increasing, especially in patients with a small glenoid or glenoid wear
This was evaluated by comparing micromotion at the glenoid-glenosphere interface in biomechanical testing and impingement-free range of motion in abduction, adduction, internal rotation, and external rotation in a simulated computer model of freshfrozen cadavers with a small glenoid
We evaluated the influence of baseplate size in reverse shoulder arthroplasty (RSA) multiply by assessing micromotion in biomechanical testing and impingement-free abduction and adduction arc of motion in a simulated computer model
Summary
Use of a baseplate with a smaller diameter in reverse shoulder arthroplasty is increasing, especially in patients with a small glenoid or glenoid wear. There have been several efforts to improve stability of glenoid component was to determine whether a 25-mm baseplate is beneficial to initial stability of the glenoid component and impingement-free range of motion in a relatively small glenoid, compared to that with a 29-mm baseplate. We hypothesized that the smaller 25-mm baseplate would provide better initial fixation stability, lesser micromotion, and more impingement-free range of motion than the commonly used 29-mm baseplate. This was evaluated by comparing micromotion at the glenoid-glenosphere interface in biomechanical testing and impingement-free range of motion in abduction, adduction, internal rotation, and external rotation in a simulated computer model of freshfrozen cadavers with a small glenoid
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