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Anatomic factors influencing the anterior stability of reverse total shoulder arthroplasty.

Authors :
Pastor MF
Smith T
Ellwein A
Hagenah J
Hurschler C
Ferle M
Source :
Journal of shoulder and elbow surgery [J Shoulder Elbow Surg] 2020 Dec; Vol. 29 (12), pp. 2619-2625. Date of Electronic Publication: 2020 Jun 09.
Publication Year :
2020

Abstract

Background: Several factors affect the stability of the reverse shoulder arthroplasty. The influence of bony anatomy on anterior stability remains unclear. This study aimed to identify the correlations between bony anatomy and anterior dislocation forces.<br />Methods: The differences in anterior dislocation force in reverse total shoulder arthroplasty reported in a previous biomechanical study were used to analyze the anatomic factors influencing anterior stability. The critical shoulder angle, glenocoracoid distance in 2 planes, and glenoid inclination were measured in the tested specimens using 3-dimensional computed tomographic scans and radiographs. Anatomic parameters were then correlated with the anterior dislocation forces.<br />Results: The critical shoulder angle had no correlation with anterior stability. The glenocoracoid distance in anteroposterior direction showed a negative correlation with the stability of a reverse shoulder arthroplasty with a 9-mm lateralized glenosphere and 155° humeral inclination in 30° and 60° glenohumeral abduction with the arm in 30° external rotation (r = -0.662, P = .004; r = -0.794, P = .011) and 30° glenohumeral abduction with neutral rotation (r = -0.614, P = .009). Using the same hardware configuration, the anterior stability had a negative correlation with the glenocoracoid distance in the mediolateral direction in 30° of glenohumeral abduction with the arm in 0° and 30° of external rotation (r = -0.542, P = .025; r = -0.497, P = .042).<br />Conclusion: The distance between the coracoid tip and glenoid in 2 planes had a significant negative correlation with the anterior stability of the reverse shoulder arthroplasty with a lateralized glenosphere and 155° humeral inclination. The findings suggest that only glenoid lateralization is influenced by the bony anatomy.<br /> (Copyright © 2020 Journal of Shoulder and Elbow Surgery Board of Trustees. Published by Elsevier Inc. All rights reserved.)

Details

Language :
English
ISSN :
1532-6500
Volume :
29
Issue :
12
Database :
MEDLINE
Journal :
Journal of shoulder and elbow surgery
Publication Type :
Academic Journal
Accession number :
32532522
Full Text :
https://doi.org/10.1016/j.jse.2020.03.045