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Hennicke NS, Saemann M, Kluess D, et al. Subject specific finite element modelling of periprosthetic femoral fractures in different load cases. J Mech Behav Biomed Mater. 2021;126:105059doi: 10.1016/j.jmbbm.2021.105059.
Hennicke, N. S., Saemann, M., Kluess, D., Bader, R., & Sander, M. (2021). Subject specific finite element modelling of periprosthetic femoral fractures in different load cases. Journal of the mechanical behavior of biomedical materials, 126105059. https://doi.org/10.1016/j.jmbbm.2021.105059
Hennicke, N S, et al. "Subject specific finite element modelling of periprosthetic femoral fractures in different load cases." Journal of the mechanical behavior of biomedical materials vol. 126 (2021): 105059. doi: https://doi.org/10.1016/j.jmbbm.2021.105059
Hennicke NS, Saemann M, Kluess D, Bader R, Sander M. Subject specific finite element modelling of periprosthetic femoral fractures in different load cases. J Mech Behav Biomed Mater. 2021 Dec 26;126:105059. doi: 10.1016/j.jmbbm.2021.105059. Epub 2021 Dec 26. PMID: 34995835.
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J Mech Behav Biomed Mater. 2021 Dec 26;126:105059. doi: 10.1016/j.jmbbm.2021.105059. Epub 2021 Dec 26.

Subject specific finite element modelling of periprosthetic femoral fractures in different load cases.

Journal of the mechanical behavior of biomedical materials

N S Hennicke, M Saemann, D Kluess, R Bader, M Sander

Affiliations

  1. Institute of Structural Mechanics, University of Rostock, Albert-Einstein-Str. 2, 18059, Rostock, Germany. Electronic address: [email protected].
  2. Biomechanics and Implant Technology Research Laboratory, Department of Orthopaedics, Rostock University Medical Center, Rostock, Germany.
  3. Institute of Structural Mechanics, University of Rostock, Albert-Einstein-Str. 2, 18059, Rostock, Germany.

PMID: 34995835 DOI: 10.1016/j.jmbbm.2021.105059

Abstract

Periprosthetic femoral fractures (PFF) around total hip replacements are one of the biggest challenges for orthopaedic surgeons. To understand the risk factors and formation of these fractures, the development of a reliable finite element (FE) model incorporating bone failure is essential. Due to the anisotropic and complex hierarchical structure of bone, the mechanical behaviour under large strains is difficult to predict. In this study, a state-of-the-art subject specific FE modelling technique for bone is utilised to generate and investigate PFF. A bilinear constitutive law is applied to bone tissue in subject specific FE models of five human femurs which are virtually implanted with a straight hip stem to numerically analyse PFF. The material parameters of the models are expressed as a function of bone ash density and mapped node wise to the FE mesh. In this way the subject specific, heterogeneous structure of bone is mimicked. For material mapping of the parameters, computed tomography (CT) images of the original fresh-frozen femurs are used. Periprosthetic fractures are generated by deleting elements on the basis of a critical plastic strain failure criterion. The models are analysed under physiological and clinically relevant conditions in two different load cases re-enacting stumbling and a sideways fall on the hip. The results of the analyses are quantified with experimental data from previous work. With regard to fracture pattern, stiffness and failure load the simulations of the load case stumbling delivered the most stable and accurate results. In general, mapping of material properties was found to be an appropriate way to reproduce PFF with finite element models.

Copyright © 2022 Elsevier Ltd. All rights reserved.

Keywords: Bone tissue; Cementless hip stem; Damage; Element deletion; Finite element analysis; Fracture; Periprosthetic femoral fracture; Sideways fall; Stumbling; Subject specific modelling

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