Oxidation and other property changes of a remelted highly crosslinked UHMWPE in retrieved tibial bearings

This study examined retrieved UHMWPE tibial bearings made from a remelted highly crosslinked (HXL) UHMWPE to determine whether the material is chemically stable in vivo. Retrieved tibial components were measured for changes in ketone oxidation and crosslink density. Oxidation increased with in vivo...

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Bibliographic Details
Published in:Journal of biomedical materials research. Part B, Applied biomaterials Applied biomaterials, 2017-01, Vol.105 (1), p.39-45
Main Authors: Reinitz, Steven D, Currier, Barbara H, Levine, Rayna A C, Collier, John P, Van Citters, Douglas W
Format: Article
Language:English
Subjects:
Animals
Bearings
Biomedical materials
Crosslinking
Density
In vivo methods and tests
Ketones
Knee
Materials research
Materials science
Mechanical properties
Organic chemistry
Oxidation
Oxidation-Reduction
Polyethylenes - chemistry
Polyethylenes - pharmacokinetics
Polyethylenes - pharmacology
Tibia - injuries
Tibia - metabolism
Tibia - pathology
Tibial components
Ultra high molecular weight polyethylene
Weight-Bearing
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Summary:This study examined retrieved UHMWPE tibial bearings made from a remelted highly crosslinked (HXL) UHMWPE to determine whether the material is chemically stable in vivo. Retrieved tibial components were measured for changes in ketone oxidation and crosslink density. Oxidation increased with in vivo duration, and a significant decrease in crosslink density with increased mean ketone oxidation index was observed. These results suggest that in vivo oxidation is causing material degradation. Furthermore, a subsurface whitened damage region was found below the articular surface of one bearing, indicating the possibility of a clinically relevant decrease in mechanical properties of this component. © 2015 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 105B: 39-45, 2017.
ISSN:1552-4973
1552-4981
DOI:10.1002/jbm.b.33533