Reverse shoulder arthroplasty glenoid lateralization influences scapular spine strains

Background Scapular spine insufficiency fractures following reverse shoulder arthroplasty are poorly understood. There exists limited literature regarding the role of reverse shoulder arthroplasty lateralization on scapular spine strains and fractures. The purpose of this cadaveric biomechanical sim...

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Bibliographic Details
Published in:Shoulder & elbow 2021-10, Vol.13 (6), p.610-619
Main Authors: Kerrigan, Alicia M, Reeves, Jake, Langohr, G Daniel G, Johnson, James A, Athwal, George S
Format: Article
Language:English
Subjects:
Shoulder
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Summary:Background Scapular spine insufficiency fractures following reverse shoulder arthroplasty are poorly understood. There exists limited literature regarding the role of reverse shoulder arthroplasty lateralization on scapular spine strains and fractures. The purpose of this cadaveric biomechanical simulator study was to evaluate the role of glenoid lateralization on scapular spine strain. Methods Eight cadaveric shoulders were tested using an in-vitro simulator. A custom modular reverse shoulder arthroplasty was implanted that allowed for in-situ glenoid lateralization adjustment. Scapular spine strain was measured by strain gauges placed in clinically relevant Levy zones along the scapular spine. All specimens were tested in loaded forward elevation and abduction. Results Glenoid lateralization from 0 to 5 mm caused negligible changes in scapular spine strains. Lateralization from 5 to 10 mm, however, caused significant increases in strain at 0° forward elevation in all strain gauges (p 
ISSN:1758-5732
1758-5740
DOI:10.1177/1758573220935567