Experimental Validation of an ITAP Numerical Model and the Effect of Implant Stem Stiffness on Bone Strain Energy
Artikel i vetenskaplig tidskrift, 2020

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.

Författare

Kirstin Ahmed

Bionik

Catherine Pendegrass

University College London (UCL)

Tim Briggs

Royal National Orthopaedic hospital

William Aston

Royal National Orthopaedic hospital

Merhan Moazen

University College London (UCL)

Richard Greene

Strain solutions

Gordon Blunn

University of Portsmouth

Annals of Biomedical Engineering

0090-6964 (ISSN) 15739686 (eISSN)

Ämneskategorier

Biomaterialvetenskap

Ortopedi

DOI

10.1007/s10439-020-02456-6

Mer information

Skapat

2024-02-13