title: Correlation between in vivo stresses and oxidation of UHMWPE in total hip arthroplasty.
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.
authors: Chemistry Department and NIS Centre, University of Turin, Turin, Italy.
authors: M
authors: M
authors: Regis
authors: P
authors: P
authors: Bracco
authors: L
authors: L
authors: Giorgini
authors: S
authors: S
authors: Fusi
authors: P
authors: P
authors: Dalla Pria
authors: L
authors: L
authors: Costa
authors: C
authors: C
authors: Schmid
mesh_terms: D019644:Arthroplasty, Replacement, Hip; D006801:Humans; D010084:Oxidation-Reduction; D011095:Polyethylenes / Q000737:chemistry*; D013314:Stress, Mechanical
chemical_list: D011095:Polyethylenes; C111601:ultra-high molecular weight polyethylene