A modelling approach demonstrating micromechanical changes in the tibial cemented interface due to in vivo service |
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| Affiliation: | 1. Radboud University Medical Center, Radboud Institute for Health Sciences, Nijmegen, The Netherlands;2. Department of Orthopedic Surgery, State University of New York, Upstate Medical University, Syracuse, NY, USA;3. University of Twente, Laboratory for Biomechanical Engineering, Faculty of Engineering Technology, Enschede, The Netherlands;1. Institute of Environmental Engineering, ETH Zurich, Zurich, Switzerland;2. Institute for Biomedical Engineering, University and ETH Zurich, Zurich, Switzerland;1. Department of Sport, Health and Exercise Science, University of Hull, UK;2. Faculty of Health Sciences, University of Sydney, Australia;3. Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, UK;1. Division of Biomedical Engineering, The Chinese University of Hong Kong, Hong Kong;2. School of Biomedical Sciences, The Chinese University of Hong Kong, Hong Kong;1. Department of Information Engineering, Università Politecnica delle Marche, Ancona, Italy;2. Department of Electronics and Telecommunications, Politecnico di Torino, Torino, Italy;3. Rehabilitation Unit, S. Croce Hospital, A.S.L. TO5, Moncalieri (TO), Torino, Italy;1. Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan;2. Division of Dental Informatics, Osaka University Dental Hospital, 1-8 Yamadaoka, Suita, Osaka 565-0871, Japan;1. School of Health Sciences, University of Salford, M6 6PU, UK;2. School of Computing, Science and Engineering, University of Salford, M5 4WT, UK |
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| Abstract: | Post-operative changes in trabecular bone morphology at the cement-bone interface can vary depending on time in service. This study aims to investigate how micromotion and bone strains change at the tibial bone-cement interface before and after cementation. This work discusses whether the morphology of the post-mortem interface can be explained by studying changes in these mechanical quantities. Three post-mortem cement-bone interface specimens showing varying levels of bone resorption (minimal, extensive and intermediate) were selected for this study Using image segmentation techniques, masks of the post-mortem bone were dilated to fill up the mould spaces in the cement to obtain the immediately post-operative situation. Finite element (FE) models of the post-mortem and post-operative situation were created from these segmentation masks. Subsequent removal of the cement layer resulted in the pre-operative situation. FE micromotion and bone strains were analyzed for the interdigitated trabecular bone. For all specimens micromotion increased from the post-operative to the post-mortem models (distally, in specimen 1: 0.1 to 0.5 µm; specimen 2: 0.2 to 0.8 µm; specimen 3: 0.27 to 1.62 µm). Similarly bone strains were shown to increase from post-operative to post-mortem (distally, in specimen 1: −185 to −389 µε; specimen 2: −170 to −824 µε; specimen 3: −216 to −1024 µε). Post-mortem interdigitated bone was found to be strain shielded in comparison with supporting bone indicating that failure of bone would occur distal to the interface. These results indicate that stress shielding of interdigitated trabeculae is a plausible explanation for resorption patterns observed in post-mortem specimens. |
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| Keywords: | Bone–cement interface Finite element analysis Micromotion Bone strain Tibial loosening |
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