Fatigue crack propagation in polymethylmethacrylate bone cements |
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| Authors: | Timothy M Wright Raymond P Robinson |
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| Affiliation: | (1) Department of Biomechanics, The Hospital for Special Surgery, affiliated with The New York Hospital and Cornell University Medical College, 535 East 70 Street, 10021 New York, New York, USA;(2) The Mason Clinic, 1100 Ninth Avenue, 98111 Seattle, Washington, USA |
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| Abstract: | The fatigue crack propagation behaviour of a conventional polymethylmethacrylate (PMMA) bone  cement was examined and compared with those of a low-viscosity PMMA cement and a carbon-fibre reinforced PMMA cement. The low-viscosity PMMA cement, developed for use in cement pressurization systems, did not differ significantly from conventional PMMA cement in its crack propagation behaviour. The carbon-fibre reinforced PMMA cement exhibited crack propagation rates which were approximately an order of magnitude less than those of conventional PMMA at the same range of stress intensity factor. Fractography of the test specimens revealed separation around prepolymerized PMMA beads and void formation around barium sulphate particles. Examination of carbon reinforced PMMA specimens showed poor mechanical bonding between the carbon fibres and the PMMA with considerable fibre pull-out and evidence of fibre breakage. |
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