A subject-specific FEM to predict deep tissue mechanical stresses when supine: Development of efficient contact interfaces using Shared Topology

Prior studies have demonstrated Finite Element (FE) analysis is a useful tool when analysing the complex interplay of tissue and body loads which act through the human pelvis in a subject lying supine. The computational accuracy and efficiency of FE models that contain complex non-linear geometric i...

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Bibliographic Details
Published inJournal of biomechanics Vol. 137; p. 111085
Main Authors Rayward, Lionel, Little, J. Paige
Format Journal Article
LanguageEnglish
Published United States Elsevier Ltd 01.05.2022
Elsevier Limited
Subjects
Bonding
Boolean
Compressive properties
Computer applications
Contact stresses
Editing
Finite element
Finite element method
Geometry
Interfaces
Lying
Magnetic resonance imaging
Mathematical models
Medical imaging
Muscles
Ogden
Pelvis
Sacrum
Shared topology
Tissue mechanics
Topology
Vertebrae
United States > US
Lying
Shared topology
Tissue mechanics
Pelvis
Ogden
Finite element
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Summary:Prior studies have demonstrated Finite Element (FE) analysis is a useful tool when analysing the complex interplay of tissue and body loads which act through the human pelvis in a subject lying supine. The computational accuracy and efficiency of FE models that contain complex non-linear geometric interfaces between different anatomical and tissue regions can be compromised by superfluous node interactions and contact penetrations. This study proposes a method for the development of efficient contact definitions using shared topology. The Shared Topology Finite Element Model (FEM) resulted in a 37% reduction in solution time compared to an equivalent FEM defined with Bonded contact. At all tissue interfaces, contact penetration occurred in the Bonded FEM, with subsequent under-prediction of peak compressive strains and stresses by 1–7% compared to the Shared Topology FEM. Simulating supine lying of a 19-year-old male, the Shared Topology FEM predicted peak compressive stress in the muscle interfacing the sacrum of 29.4 kPa, and peak compressive strain of 50%. The proposed methodology can be applied for any medical imaging derived FEM where there are multiple congruent 3D geometries with negligible sliding across interfaces.
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ISSN:0021-9290
1873-2380
1873-2380
DOI:10.1016/j.jbiomech.2022.111085