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BMC Musculoskeletal Disorders
Published in: BMC Musculoskeletal Disorders 1/2014

Open Access 01-12-2014 | Research article

Effect of baseplate size on primary glenoid stability and impingement-free range of motion in reverse shoulder arthroplasty

Authors: Soo-Won Chae, Soung-Yon Kim, Haea Lee, Joung-Ro Yon, Juneyoung Lee, Seung-Ho Han

Published in: BMC Musculoskeletal Disorders | Issue 1/2014

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Abstract

Background

Use 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).

Methods

Micromotion 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.

Results

Micromotion 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.

Conclusions

Use 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.
Appendix
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Metadata
Title
Effect of baseplate size on primary glenoid stability and impingement-free range of motion in reverse shoulder arthroplasty
Authors
Soo-Won Chae
Soung-Yon Kim
Haea Lee
Joung-Ro Yon
Juneyoung Lee
Seung-Ho Han
Publication date
01-12-2014
Publisher
BioMed Central
Published in
BMC Musculoskeletal Disorders / Issue 1/2014
Electronic ISSN: 1471-2474
DOI
https://doi.org/10.1186/1471-2474-15-417

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