Effect of γ-irradiation sterilization in nitrogen on oxidation of hip-simulated UHMWPE cups
(English)Manuscript (preprint) (Other academic)
A hip simulator study with roughened heads revealed unexpected high wear rates for the γ-irradiated UHMWPE cups (sterilization performed in nitrogen) and also higher fluid absorbtion than that of the non-sterilized cups. Infrared spectroscopy and high-resolution scanning of samples stained with HCl and SO2 showed that the outer parts of cross-sections of the sterilized cups were oxidized after the wear testing. The non-sterilized cups showed essentially no polymer oxidation with only minor surface oxidation due to roughened head. The higher wear rate and the more extensive fluid absorption of the sterilized cups is thus attributed to oxidation of the polymer; the latter presumably being facilitated by the presence of long-living radicals generated during γ-irradiation sterilization.
UHMWPE; gamma irriadiation; sterilization; oxidation
Medical Laboratory and Measurements Technologies
IdentifiersURN: urn:nbn:se:kth:diva-14278OAI: oai:DiVA.org:kth-14278DiVA: diva2:331996
QC 201007292010-07-292010-07-292010-07-29Bibliographically approved