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    Pull-out strength comparison of a novel expanding fastener against an orthopaedic screw in an ovine vertebral body: an ex-vivo study

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    Fulltext not available
    Authors
    Oldakowski, M.
    Oldakowska, I.
    Kirk, T.
    Ford, Chris
    Sercombe, T.
    Hardcastle, P.
    Day, R.
    Date
    2016
    Type
    Journal Article
    
    Metadata
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    Citation
    Oldakowski, M. and Oldakowska, I. and Kirk, T. and Ford, C. and Sercombe, T. and Hardcastle, P. and Day, R. 2016. Pull-out strength comparison of a novel expanding fastener against an orthopaedic screw in an ovine vertebral body: an ex-vivo study. Journal of Medical Engineering and Technology. 40 (2): pp. 43-51.
    Source Title
    Journal of Medical Engineering and Technology
    DOI
    10.3109/03091902.2015.1127441
    ISSN
    0309-1902
    School
    Department of Mechanical Engineering
    URI
    http://hdl.handle.net/20.500.11937/10971
    Collection
    • Curtin Research Publications
    Abstract

    © 2016 Taylor & Francis The purpose of this study was to mechanically test a novel Unthreaded Expandable Fastener (UEF), manufactured using Selective Laser Melting, which was designed for fixation in the cervical lateral mass. The pull-out strength and stiffness of the prototype UEFs was evaluated in a non-osteoporotic ovine bone model against equivalent screws. The prototype UEF demonstrated a 41% increase in failure force and a 60% reduction in failure force standard deviation compared to the screws. All bone samples were micro CT-scanned and no significant differences in bone microstructural properties was found between the screw and UEF sample sets, indicating that the UEFs may be less sensitive to bone quality variation. This increased performance can potentially translate into improved surgical outcome and reduced surgical risk for lateral mass fixation. With further design optimisation, additional improvement in performance over screws may be possible in future studies.

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