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The effect of bone growth onto massive prostheses collars in protecting the implant from fracture

Fromme, P; Blunn, GW; Aston, WJ; Abdoola, T; Koris, J; Coathup, MJ; (2017) The effect of bone growth onto massive prostheses collars in protecting the implant from fracture. Medical Engineering & Physics , 41 pp. 19-25. 10.1016/j.medengphy.2016.12.007. Green open access

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Abstract

Limb-sparing distal femoral endoprotheses used in cancer patients have a high risk of aseptic loosening. It had been reported that young adolescent patients have a higher rate of loosening and fatigue fracture of intramedullary stems because the implant becomes undersized as patients grow. Extracortical bone growth into the grooved hydroxyapatite-coated collar had been shown to reduce failure rates. The stresses in the implant and femur have been calculated from Finite Element models for different stages of bone growth onto the collar. For a small diameter stem without any bone growth, a large stress concentration at the implant shoulder was found, leading to a significant fracture risk under normal walking loads. Bone growth and osseointergration onto the implant collar reduced the stress level in the implant to safe levels. For small bone bridges a risk of bone fracture was observed.

Type: Article
Title: The effect of bone growth onto massive prostheses collars in protecting the implant from fracture
Location: England
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.medengphy.2016.12.007
Publisher version: http://dx.doi.org/10.1016/j.medengphy.2016.12.007
Language: English
Additional information: Copyright © 2017. This manuscript version is published under a Creative Commons Attribution Non-commercial Non-derivative 4.0 International licence (CC BY-NC-ND 4.0). This licence allows you to share, copy, distribute and transmit the work for personal and non-commercial use providing author and publisher attribution is clearly stated. Further details about CC BY licences are available at http://creativecommons.org/licenses/by/4.0. Access may be initially restricted by the publisher.
Keywords: Bone growth, Finite Element Analysis, HA collar, Orthopaedics, Prostheses
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/1536423
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