Photoelastic comparison of strains in the underlying glenoid with metal-backed and all-polyethylene implants

An alteration in the stress and strain environment following arthroplasty is believed to lead to bone remodeling, which can trigger implant loosening and subsequent failure. Bone remodeling, while well-studied in hip arthroplasty, has received less attention in total shoulder replacement. This study...

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Bibliographic Details
Published in:Journal of shoulder and elbow surgery 2008-09, Vol.17 (5), p.779-783
Main Authors: Pelletier, Matthew H., PhD, Langdown, Andrew, MBBS, FRACS, Gillies, R. Mark, PhD, Sonnabend, David H., MBBS, FRACS, Walsh, William R., PhD
Format: Article
Language:English
Subjects:
Aged
Arthroplasty, Replacement - adverse effects
Biocompatible Materials
Biological and medical sciences
Biomechanical Phenomena
Bone Remodeling - physiology
Cadaver
Diseases of the osteoarticular system
Humans
Joint Prosthesis
Medical sciences
Middle Aged
Orthopedics
Polyethylene
Prosthesis Failure
Scapula - physiology
Scapula - physiopathology
Shear Strength
Shoulder Joint - physiopathology
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Summary:An alteration in the stress and strain environment following arthroplasty is believed to lead to bone remodeling, which can trigger implant loosening and subsequent failure. Bone remodeling, while well-studied in hip arthroplasty, has received less attention in total shoulder replacement. This study examines differences in strain states between intact glenoids and following replacement with an uncemented metal backed keeled component and a cemented all polyethylene pegged component with the same articular geometry, using the photoelastic method. Strain measurements were taken in glenoids before and after implantation under 4 loading conditions corresponding to 4 abduction angles: 0°, 30°, 60°, and 90°. Shear strains increased at most locations following reconstruction with both of the implants. Uncemented, keeled metal backed implants produced areas of higher cortical shear strains compared to cemented, all PE pegged implants.
ISSN:1058-2746
1532-6500
DOI:10.1016/j.jse.2008.01.138