Trabecular deformations during screw pull-out: a micro-CT study of lapine bone
Identifieur interne : 000C18 ( Pmc/Curation ); précédent : 000C17; suivant : 000C19Trabecular 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
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<front><div type="abstract" xml:lang="en"><p id="Par1">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.</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>
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<front><journal-meta><journal-id journal-id-type="nlm-ta">Biomech Model Mechanobiol</journal-id>
<journal-id journal-id-type="iso-abbrev">Biomech Model Mechanobiol</journal-id>
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<issn pub-type="ppub">1617-7959</issn>
<issn pub-type="epub">1617-7940</issn>
<publisher><publisher-name>Springer Berlin Heidelberg</publisher-name>
<publisher-loc>Berlin/Heidelberg</publisher-loc>
</publisher>
</journal-meta>
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<article-id pub-id-type="pmc">5511599</article-id>
<article-id pub-id-type="publisher-id">891</article-id>
<article-id pub-id-type="doi">10.1007/s10237-017-0891-9</article-id>
<article-categories><subj-group subj-group-type="heading"><subject>Original Paper</subject>
</subj-group>
</article-categories>
<title-group><article-title>Trabecular deformations during screw pull-out: a micro-CT study of lapine bone</article-title>
</title-group>
<contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">http://orcid.org/0000-0002-1524-2497</contrib-id>
<name><surname>Joffre</surname>
<given-names>Thomas</given-names>
</name>
<address><email>thomas.joffre@angstrom.uu.se</email>
</address>
<xref ref-type="aff" rid="Aff1">1</xref>
<xref ref-type="aff" rid="Aff2">2</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Isaksson</surname>
<given-names>Per</given-names>
</name>
<xref ref-type="aff" rid="Aff2">2</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Procter</surname>
<given-names>Philip</given-names>
</name>
<xref ref-type="aff" rid="Aff1">1</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Persson</surname>
<given-names>Cecilia</given-names>
</name>
<xref ref-type="aff" rid="Aff1">1</xref>
</contrib>
<aff id="Aff1"><label>1</label>
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Uppsala, Sweden</aff>
<aff id="Aff2"><label>2</label>
<institution-wrap><institution-id institution-id-type="ISNI">0000 0004 1936 9457</institution-id>
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Uppsala, Sweden</aff>
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<pub-date pub-type="epub"><day>6</day>
<month>3</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="pmc-release"><day>6</day>
<month>3</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="ppub"><year>2017</year>
</pub-date>
<volume>16</volume>
<issue>4</issue>
<fpage>1349</fpage>
<lpage>1359</lpage>
<history><date date-type="received"><day>31</day>
<month>3</month>
<year>2016</year>
</date>
<date date-type="accepted"><day>20</day>
<month>2</month>
<year>2017</year>
</date>
</history>
<permissions><copyright-statement>© The Author(s) 2017</copyright-statement>
<license license-type="OpenAccess"><license-p><bold>Open Access</bold>
This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (<ext-link ext-link-type="uri" xlink:href="http://creativecommons.org/licenses/by/4.0">http://creativecommons.org/licenses/by/4.0</ext-link>
/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.</license-p>
</license>
</permissions>
<abstract id="Abs1"><p id="Par1">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.</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>
</abstract>
<kwd-group xml:lang="en"><title>Keywords</title>
<kwd>Screws</kwd>
<kwd>Implants</kwd>
<kwd>Trabecular bone</kwd>
<kwd>Pull-out test</kwd>
<kwd>Digital volume correlation</kwd>
<kwd>Micro-CT</kwd>
</kwd-group>
<funding-group><award-group><funding-source><institution-wrap><institution-id institution-id-type="FundRef">http://dx.doi.org/10.13039/501100003426</institution-id>
<institution>Göran Gustafssons Stiftelse för Naturvetenskaplig och Medicinsk Forskning</institution>
</institution-wrap>
</funding-source>
<award-id>GA 1450B</award-id>
<principal-award-recipient><name><surname>Persson</surname>
<given-names>Cecilia</given-names>
</name>
</principal-award-recipient>
</award-group>
</funding-group>
<custom-meta-group><custom-meta><meta-name>issue-copyright-statement</meta-name>
<meta-value>© Springer-Verlag GmbH Germany 2017</meta-value>
</custom-meta>
</custom-meta-group>
</article-meta>
</front>
</pmc>
</record>
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