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Characterization and Accelerated Ageing of UHMWPE Used in Orthopedic Prosthesis by Peroxide
Department of Metallurgical and Materials Engineering, Laboratory of Biomaterials and Tissue Engineering, Federal University of Minas Gerais / R. Espírito Santo 35, 30160-030, Belo Horizonte, Brazil
* Author to whom correspondence should be addressed.
Received: 8 April 2009; in revised form: 29 April 2009 / Accepted: 8 May 2009 / Published: 13 May 2009
Abstract: Ultra-high molecular weight polyethylene (UHMWPE) has been the most commonly used bearing material in total joint arthroplasty. Wear and oxidation fatigue resistance of UHMWPE are regarded as two important mechanical properties to extend the longevity of knee prostheses. Though accelerated in vitro protocols have been developed to test the relative oxidation resistance of various types of UHMWPE, its mechanism is not accurately understood yet. Thus, in the present study an accelerated ageing of UHMWPE in hydrogen peroxide solution was performed and relative oxidation was extensively characterized by Fourier Transformed Infrared Spectroscopy (FTIR) spectroscopy and the morphological changes were analyzed by Scanning Electron Microscopy (SEM). Different chemical groups of UHMWPE associated with the degradation reaction were monitored for over 120 days in order to evaluate the possible oxidation mechanism(s) which may have occurred. The results have provided strong evidence that the oxidation mechanism is rather complex, and two stages with their own particular first-order kinetics reaction patterns have been clearly identified. Furthermore, hydrogen peroxide has proven to be an efficient oxidative medium to accelerate ageing of UHMWPE.
Keywords: UHMWPE; polymer degradation; polymer oxidation; accelerated aging; prosthesis
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MDPI and ACS Style
Rocha, M.; Mansur, A.; Mansur, H. Characterization and Accelerated Ageing of UHMWPE Used in Orthopedic Prosthesis by Peroxide. Materials 2009, 2, 562-576.
Rocha M, Mansur A, Mansur H. Characterization and Accelerated Ageing of UHMWPE Used in Orthopedic Prosthesis by Peroxide. Materials. 2009; 2(2):562-576.
Rocha, Magda; Mansur, Alexandra; Mansur, Herman. 2009. "Characterization and Accelerated Ageing of UHMWPE Used in Orthopedic Prosthesis by Peroxide." Materials 2, no. 2: 562-576.