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Correlation between in vivo stresses and oxidation of UHMWPE in total hip arthroplasty

Authors
  • Regis, M.1, 2
  • Bracco, P.1
  • Giorgini, L.2
  • Fusi, S.2
  • Dalla Pria, P.2
  • Costa, L.1
  • Schmid, C.3
  • 1 University of Turin, Chemistry Department and NIS Centre, Turin, Italy , Turin (Italy)
  • 2 LimaCorporate SpA, Villanova di S.Daniele, Udine, Italy , Udine (Italy)
  • 3 University of Trieste, Department of Engineering and Architecture, Trieste, Italy , Trieste (Italy)
Type
Published Article
Journal
Journal of Materials Science Materials in Medicine
Publisher
Springer-Verlag
Publication Date
Jun 29, 2014
Volume
25
Issue
9
Pages
2185–2192
Identifiers
DOI: 10.1007/s10856-014-5254-9
Source
Springer Nature
Keywords
License
Yellow

Abstract

The possibility of in vivo, stress-induced oxidation in orthopaedic UHMWPE has been investigated. EtO sterilised, uncrosslinked UHMWPE liners, explanted or shelf-aged, have been collected. Linear wear and wear rate were assessed and FTIR spectroscopy was employed to detect oxidation and to build up oxidation products spatial maps across the liners section. Oxidation profiles have been compared to stress distribution profiles, resulting from a FE analysis conducted on the same liners geometries and couplings. It was found that oxidised and stressed areas followed the same asymmetrical, localized distribution profile. It was therefore possible to establish a correlation between stressed areas and observed oxidation.

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