In vitro and finite element analysis of glenoid bone/baseplate interaction in the reverse shoulder design

We developed biomechanical and finite element models, using high-strength polyurethane foam blocks, to represent the glenoid bone/baseplate junction to determine if increasing the distance between the glenoid bone and the center of rotation of the glenosphere increases baseplate motion during static...

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Bibliographic Details
Published in:Journal of shoulder and elbow surgery 2008-05, Vol.17 (3), p.509-521
Main Authors: Virani, Nazeem A., MD, Harman, Melinda, MSc, Li, Ke, PhD, Levy, Jonathan, MD, Pupello, Derek R., MBA, Frankle, Mark A., MD
Format: Article
Language:English
Subjects:
Arthroplasty, Replacement
Biological and medical sciences
Biomechanical Phenomena
Diseases of the osteoarticular system
Finite Element Analysis
Humans
In Vitro Techniques
Joint Prosthesis
Medical sciences
Orthopedics
Prosthesis Design
Shoulder Joint - surgery
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Summary:We developed biomechanical and finite element models, using high-strength polyurethane foam blocks, to represent the glenoid bone/baseplate junction to determine if increasing the distance between the glenoid bone and the center of rotation of the glenosphere increases baseplate motion during static loading in the reverse shoulder design. Although there was a general trend toward increased baseplate motion with increasing distance from the glenoid to the center of rotation, in vitro mechanical testing revealed no significant difference between the 7 glenosphere types tested, with average baseplate motion during 1000 load cycles ranging from 90 μm to 120 μm. Results from the finite element analysis strongly correlated with the in vitro mechanical testing. The magnitude of baseplate motion occurring in a modeled representation of bone under simulated physiologic loading conditions was similar for the 7 reverse shoulder glenoid components tested in this study.
ISSN:1058-2746
1532-6500
DOI:10.1016/j.jse.2007.11.003