51312-01510-CREVICE CORROSION OF BIOMEDICAL ALLOYS: A NOVEL METHOD OF ASSESSING THE EFFECTS OF BONE CEMENTAND IT

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Product Number: 51312-01510-SG

ISBN: 01510 2012 CP

Author: Michael Bryant

Publication Date: 2012

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CREVICE CORROSION CHARACTERISTICS OF COBALT CHROMIUM MOLYBDENUM ALLOYS WHEN INTERACTING WITH PMMA BONE CEMENTS M. Bryant X. Hu A. Neville Institutes of Engineering Thermofluids Surfaces and Interfaces Woodhouse Lane Leeds LS2 9JT United Kingdom R. Farrar R. Freeman K. Brummitt DePuy International Ltd St Anthony’s Road Leeds LS11 8DT United Kingdom ABSTRACT Studies to date have identified that the introduction of antibiotics into PMMA bone cement can affect the crevice corrosion initiation and propagation mechanism of commonly used biomaterials. In this study five commercially available PMMA bone cements were tested to investigate the effects of antibiotics on the severity of crevice corrosion. Bone cements with varying chemistry were also tested. A test method was developed in part reference to ASTM F746-04. Cylindrical specimens were fitted with a bone cement tapered collar creating consistent crevice conditions. Crevice corrosion was then studied using potentiodynamic polarization technique in deaerated phosphate buffered saline solution (pH7.4) at 37°C. Localized crevice pH measurements were also taken using microelectrode technology to investigate the crevice chemistry during electrochemical testing. Surface analyses using Light microscope and scanning electron microscopy (SEM) were also conducted to investigate the surface morphology after accelerated electrochemical testing. Results indicate that the presence of antibiotics in the bone cement can reduce the breakdown potential of the tested materials. Key words: crevice corrosion biomaterials bone cement CoCrMo and 316L stainless steel ion release