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.

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

REGIS, MARCO;BRACCO, Pierangiola;COSTA, Luigi;
2014

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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http://www.springer.com/materials/biomaterials/journal/10856
UHMWPE; acetabular liners; oxidation; mechanical stress; EtO sterilisation
M. Regis; P. Bracco; L. Giorgini; S. Fusi; P. Dalla Pria; L. Costa; C. Schmid
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2318/153036
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