Enhanced wear resistance of orthopaedic bearing due to the cross-linking of poly(MPC) graft chains induced by gamma-ray irradiation.

Enhanced wear resistance of orthopaedic bearing due to the cross-linking of poly(MPC) graft chains induced by gamma-ray irradiation. Research Abstract Details 

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Enhanced wear resistance of orthopaedic bearing due to the cross-linking of poly(MPC) graft chains induced by gamma-ray irradiation. Abstract Text:

Masayuki Kyomoto,Toru Moro,Fumiaki Miyaji,Tomohiro Konno,Masami Hashimoto,Hiroshi Kawaguchi,Yoshio Takatori,Kozo Nakamura,Kazuhiko Ishihara,Masayuki Kyomoto,Toru Moro,Fumiaki Miyaji,Tomohiro Konno,Masami Hashimoto,Hiroshi Kawaguchi,Yoshio Takatori,Kozo Nakamura,Kazuhiko Ishihara,

We assumed that the extra energy supplied by gamma-ray irradiation produced cross-links in 2-methacryloyloxyethyl phosphorylcholine (MPC) polymer grafted cross-linked polyethylene (CLPE-g-MPC) and investigated its effects on the tribological properties of CLPE-g-MPC. In this study, we found that the gamma-ray irradiation produced cross-links in three kinds of regions of CLPE-g-MPC: poly(MPC) layer, CLPE-MPC interface, and CLPE substrate. The dynamic coefficient of friction of CLPE-g-MPC slightly increased with increasing irradiation doses. After the simulator test, both the nonsterilized and gamma-ray sterilized CLPE-g-MPC cups exhibited lower wear than the untreated CLPE ones. In particular, the gamma-ray sterilized CLPE-g-MPC cups showed extremely low and stable wear. As for the nonsterilized CLPE-g-MPC cups, the weight change varied with each cup. When the CLPE surface is modified by poly(MPC) grafting, the MPC graft polymer leads to a significant reduction in the sliding friction between the surfaces that are grafted because water thin films formed can behave as extremely efficient lubricants. Such a cross-link of poly(MPC) slightly increases the friction of CLPE by gamma-ray irradiation but provides a stable wear resistant layer on the friction surface. The cross-links formed by gamma-ray irradiation would give further longevity to the CLPE-g-MPC cups. (c) 2007 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater 2008.

Enhanced wear resistance of orthopaedic bearing due to the cross-linking of poly(MPC) graft chains induced by gamma-ray irradiation. Publishing Authors By Initials

M Kyomoto,T Moro,F Miyaji,T Konno,M Hashimoto,H Kawaguchi,Y Takatori,K Nakamura,K Ishihara,M Kyomoto,T Moro,F Miyaji,T Konno,M Hashimoto,H Kawaguchi,Y Takatori,K Nakamura,K Ishihara,

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Enhanced wear resistance of orthopaedic bearing due to the cross-linking of poly(MPC) graft chains induced by gamma-ray irradiation. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Journal of biomedical materials research. Part B,

VOLUME: 84

Page Numbers: 320-7

Journal Abbreviation: J. Biomed. Mater. Res. Part B

ISSN: 1552-4973

DAY: 14

MONTH: Feb

YEAR: 2008

Enhanced wear resistance of orthopaedic bearing due to the cross-linking of poly(MPC) graft chains induced by gamma-ray irradiation. Information

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LANGUAGE: eng

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Grant and Affiliation Information for Enhanced wear resistance of orthopaedic bearing due to the cross-linking of poly(MPC) graft chains induced by gamma-ray irradiation.

AFFILIATION: Research Division, Japan Medical Materials Corporation, Osaka, Japan.

Country: United States

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MEDLINETA: J Biomed Mater Res B Appl Biom

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