Trabecular deformations during screw pull-out: a micro-CT study of lapine bone
Identifieur interne : 000020 ( Main/Exploration ); précédent : 000019; suivant : 000021Trabecular deformations during screw pull-out: a micro-CT study of lapine bone
Auteurs : Thomas Joffre [Suède] ; Per Isaksson [Suède] ; Philip Procter [Suède] ; Cecilia Persson [Suède]Source :
- Biomechanics and Modeling in Mechanobiology [ 1617-7959 ] ; 2017.
Abstract
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.
The online version of this article (doi:10.1007/s10237-017-0891-9) contains supplementary material, which is available to authorized users.
Url:
DOI: 10.1007/s10237-017-0891-9
PubMed: 28265781
PubMed Central: 5511599
Affiliations:
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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.</p><sec><title>Electronic supplementary material</title><p>The online version of this article (doi:10.1007/s10237-017-0891-9) contains supplementary material, which is available to authorized users.</p></sec></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Bay, Bk" uniqKey="Bay B">BK Bay</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Brown, C" uniqKey="Brown C">C Brown</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Cao, T" uniqKey="Cao T">T Cao</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Chapman, J" uniqKey="Chapman J">J Chapman</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Chen, Y" 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Yánez</name></author><author><name sortKey="Carta, J" uniqKey="Carta J">J Carta</name></author><author><name sortKey="Garces, G" uniqKey="Garces G">G Garcés</name></author></analytic></biblStruct></listBibl></div1></back></TEI><affiliations><list><country><li>Suède</li></country></list><tree><country name="Suède"><noRegion><name sortKey="Joffre, Thomas" sort="Joffre, Thomas" uniqKey="Joffre T" first="Thomas" last="Joffre">Thomas Joffre</name></noRegion><name sortKey="Isaksson, Per" sort="Isaksson, Per" uniqKey="Isaksson P" first="Per" last="Isaksson">Per Isaksson</name><name sortKey="Joffre, Thomas" sort="Joffre, Thomas" uniqKey="Joffre T" first="Thomas" last="Joffre">Thomas Joffre</name><name sortKey="Persson, Cecilia" sort="Persson, Cecilia" uniqKey="Persson C" first="Cecilia" last="Persson">Cecilia Persson</name><name sortKey="Procter, Philip" sort="Procter, Philip" uniqKey="Procter P" first="Philip" last="Procter">Philip Procter</name></country></tree></affiliations></record>Pour 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