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KMID : 0372919970180020107
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Journal of Biomedical Engineering Research
1997 Volume.18 No. 2 p.107 ~ p.112
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Gamma-Irradiated Ultra-high Molecular Weight Polyethylene : Anisotropic Changes in Crystallinity and Crosslinking
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Kwon-Yong Lee
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Abstract
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The effect of gamma-irradiation sterilization on molecular structural changes in orthopaedic surgical-grade polyethylene was studied. The relative crystallinity ud. percent crosslinking of the substance increased as a result of the gamma irradiation and varied anisotropically as a function of depth. Samples from the articulating surfaces showed 5% Venter relative crystallinity than those from the mid-sections, whereas samples from the mid-sections exhibited 15% greater crosslinking than those from the surfaces. These anisotropic variations are discussed in assDciation with oxidation.
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