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Trabecular deformations during screw pull-out: a micro-CT study of lapine bone
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Mechanics.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.ORCID iD: 0000-0001-6663-6536
2017 (English)In: Biomechanics and Modeling in Mechanobiology, ISSN 1617-7959, E-ISSN 1617-7940, Vol. 16, no 4, p. 1349-1359Article in journal (Refereed) Published
Abstract [en]

The mechanical fixation of endosseous implants, such as screws, in trabecular bone is challenging because of the complex porous microstructure. Development of new screw designs to improve fracture fixation, especially in high-porosity osteoporotic bone, requires a profound understanding of how the structural system implant/trabeculae interacts when it is subjected to mechanical load. In this study, pull-out tests of screw implants were performed. Screws were first inserted into the trabecular bone of rabbit femurs and then pulled out from the bone inside a computational tomography scanner. The tests were interrupted at certain load steps to acquire 3D images. The images were then analysed with a digital volume correlation technique to estimate deformation and strain fields inside the bone during the tests. The results indicate that the highest shear strains are concentrated between the inner and outer thread diameter, whereas compressive strains are found at larger distances from the screw. Tensile strains were somewhat smaller. Strain concentrations and the location of trabecular failures provide experimental information that could be used in the development of new screw designs and/or to validate numerical simulations.

Place, publisher, year, edition, pages
SPRINGER HEIDELBERG , 2017. Vol. 16, no 4, p. 1349-1359
Keywords [en]
Screws, Implants, Trabecular bone, Pull-out test, Digital volume correlation, Micro-CT
National Category
Medical Materials
Identifiers
URN: urn:nbn:se:uu:diva-331218DOI: 10.1007/s10237-017-0891-9ISI: 000405489600016PubMedID: 28265781OAI: oai:DiVA.org:uu-331218DiVA, id: diva2:1150203
Funder
Göran Gustafsson Foundation for Research in Natural Sciences and Medicine, GA 1450BAvailable from: 2017-10-18 Created: 2017-10-18 Last updated: 2017-10-20Bibliographically approved

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