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Structure modification of UHMWPE used for total joint replacements

✍ Scribed by Martina Nevoralová; Josef Baldrian; Jan Pospíšil; Ivan Chodák; Zdeněk Horák

Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
139 KB
Volume
74B
Category
Article
ISSN
1552-4973

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✦ Synopsis

Abstract

Modification of ultrahigh‐molecular‐weight polyethylene (UHMWPE) consisting of a combination of γ irradiation and subsequent thermal treatment has been performed in order to investigate the reasultant changes to its supramolecular structure. In the first step the polymer was irradiated by γ rays at laboratory temperature under nitrogen. Five radiation doses (25, 50, 100, 150, and 200 kGy) were applied at two dose rates (0.25 and 2.5 kGy/h). In the second step the irradiated samples were thermally treated above the UHMWPE melting temperature. Insoluble fraction, crystallinity (fraction), and lamellar periodicity were determined as functions of dose and dose rate for irradiated samples before and after thermal treatment. Both modification steps were shown to produce substantial changes in the UHMWPE structure. © 2005 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2005

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