Does the model reflect the system? When two-dimensional biomechanics is not 'good enough'

Area of Science:

• Biomechanics
• Computational Biology
• Paleontology

Background:

• Finite-element modeling (FEM) is crucial for in silico biological research.
• Simplifications in FEM are necessary but must preserve biomechanical accuracy.
• Two-dimensional (2D) models may inaccurately represent 3D structures, impacting functional interpretations.

Purpose of the Study:

• To compare the accuracy of 2D versus 3D finite-element models of the chimpanzee mandible.
• To identify how dimensionality, geometry, and constraints influence biomechanical modeling outcomes.
• To determine the suitability of 2D FEM for analyzing complex 3D anatomical structures.

Main Methods:

• Developed and compared 3D and 2D finite-element models of a chimpanzee mandible.
• Conducted comparative analysis of stress and strain regimes between 2D and 3D models.
• Performed simulation experiments varying dimensionality, symmetry, and constraints.

Main Results:

• Significant fundamental differences were observed between 2D and 3D chimpanzee mandible models.
• Modeling parameters like dimensionality and constraints critically affect deformation and strain patterns.
• Two-dimensional finite-element analysis inaccurately represents the biomechanics of the primate mandible.

Conclusions:

• Two-dimensional finite-element modeling is inadequate for analyzing the biomechanics of the primate mandible.
• Results from 2D FEM of 3D structures should not be used for functional, ecological, or evolutionary inferences.
• Three-dimensional finite-element modeling is essential for accurate biomechanical analysis of complex anatomical structures.