Validation of composite finite elements efficiently simulating elasticity of trabecular bone

Area of Science:

• Biomechanics
• Materials Science
• Medical Imaging

Background:

• Osteoporosis management requires precise patient-specific bone mechanical property analysis.
• Evaluating the mechanical integrity of trabecular bone is crucial for fracture risk assessment.

Purpose of the Study:

• To investigate the efficacy of composite finite elements (CFEs), a novel finite element technique, for assessing vertebral trabecular bone apparent stiffness.
• To validate CFE simulations against experimental data and assess computational efficiency.

Main Methods:

• Simulated elasticity of trabecular bone specimens under uniaxial loading using CFEs.
• Compared simulated apparent stiffnesses with experimentally determined values.
• Assessed computational efficiency and provided recommendations for simulation parameters.

Main Results:

• CFE simulations showed strong concordance with experimental data (concordance correlation coefficients 0.69–0.92) for resolutions finer than 168 μm.
• Achieved an average error of 5.8% between experimental and numerical results at 24 μm resolution.
• Successfully computed local, macroscopic stiffness tensors for a lumbar vertebra's trabecular structure.

Conclusions:

• CFE technique provides accurate patient-specific assessment of bone stiffness.
• The method is computationally efficient and compatible with high-resolution quantitative CT resolutions.
• CFEs represent a valuable tool for enhancing osteoporosis patient management through detailed bone mechanical analysis.