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Experimental validation of an ITAP numerical model and the effect of implant stem stiffness on bone strain energy

Ahmed, K; Greene, RJ; Aston, W; Briggs, T; Pendegrass, C; Moazen, M; Blunn, G; (2020) Experimental validation of an ITAP numerical model and the effect of implant stem stiffness on bone strain energy. Annals of Biomedical Engineering 10.1007/s10439-020-02456-6. (In press). Green open access

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Abstract

The Intraosseous Transcutaneous Amputation Prosthesis (ITAP) offers transfemoral amputees an ambulatory method potentially reducing soft tissue complications seen with socket and stump devices. This study validated a finite element (in silico) model based on an ITAP design and investigated implant stem stiffness influence on periprosthetic femoral bone strain. Results showed good agreement in the validation of the in silico model against the in vitro results using uniaxial strain gauges and Digital Image Correlation (DIC). Using Strain Energy Density (SED) thresholds as the stimulus for adaptive bone remodelling, the validated model illustrated that: (a) bone apposition increased and resorption decreased with increasing implant stem flexibility in early stance; (b) bone apposition decreased (mean change = − 9.8%) and resorption increased (mean change = 20.3%) from distal to proximal in most stem stiffness models in early stance. By engineering the flow of force through the implant/bone (e.g. by changing material properties) these results demonstrate how periprosthetic bone remodelling, thus aseptic loosening, can be managed. This paper finds that future implant designs should be optimised for bone strain under a variety of relevant loading conditions using finite element models to maximise the chances of clinical success.

Type: Article
Title: Experimental validation of an ITAP numerical model and the effect of implant stem stiffness on bone strain energy
Open access status: An open access version is available from UCL Discovery
DOI: 10.1007/s10439-020-02456-6
Publisher version: https://doi.org/10.1007/s10439-020-02456-6
Language: English
Additional information: © The Author(s) 2020. This article is licensed under a Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/).
Keywords: Amputee biomechanics, Bone density, Bone anchored implants, Digital Image Correlation, Direct skeletal attachment, Finite Element Analysis, Osseointegration, Strain Energy Density, Strain gauge validation, Transfemoral amputees
UCL classification: UCL
UCL > Provost and Vice Provost Offices
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 > School of Life and Medical Sciences > Faculty of Medical Sciences > Div of Surgery and Interventional Sci
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Div of Surgery and Interventional Sci > Department of Ortho and MSK Science
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/10090370
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