Three-dimensional finite element modelling of non-invasively assessed trabecular bone structures

Area of Science:

• Biomedical Engineering
• Orthopedics
• Materials Science

Background:

• Cancellous bone's 3D microstructure is crucial for predicting mechanical properties like strength and stiffness.
• Non-destructive assessment methods are needed to evaluate bone properties without damaging the sample.

Purpose of the Study:

• To demonstrate the potential of high-resolution CT imaging for predicting the anisotropic material properties of cancellous bone.
• To develop and validate a method for creating 3D finite element models from CT data.

Main Methods:

• High-resolution computed tomography (CT) with 250-micron spatial resolution was used for non-destructive assessment.
• A 3D segmentation algorithm separated mineralized bone from surrounding tissues.
• An automated mesh generator created 3D finite element models using four-noded tetrahedron solid elements.

Main Results:

• A "non-invasive bone biopsy" subvolume (3.6 x 3.4 x 3.4 mm3) was analyzed.
• Preliminary 3D finite element stress analysis yielded promising results.
• The predicted apparent Young's modulus (564 MPa) aligns with experimental data from uniaxial compression tests.

Conclusions:

• High-resolution CT imaging shows significant potential for predicting cancellous bone's anisotropic mechanical properties.
• The developed methodology provides a non-destructive approach for analyzing bone microstructure and predicting its mechanical behavior.
• This technique could advance the understanding and clinical assessment of bone diseases and treatments.