Nonlinear finite element analysis of C0-C1-C2 complex under physiologic loads.

Area of Science:

• Biomechanics
• Finite Element Analysis
• Human Anatomy

Background:

• The upper cervical spine (occipito-atlanto-axial complex, C0-C1-C2) is critical for head movement.
• Understanding its biomechanics is essential for diagnosing and treating related pathologies.
• Previous finite element models have limitations in accurately representing the complex geometry and material properties.

Purpose of the Study:

• To develop a comprehensive, geometric, nonlinear finite element model of the occipito-atlanto-axial (C0-C1-C2) complex.
• To utilize the Visible Human Male dataset for enhanced geometric and material accuracy.
• To validate the model's biomechanical response against experimental data.

Main Methods:

• Development of a 3D finite element model of the C0-C1-C2 complex.
• Incorporation of detailed geometric and material properties from the Visible Human Male dataset.
• Validation of the model under four physiologic loading modes by comparing results with published experimental data.

Main Results:

• The developed finite element model accurately predicted the biomechanical response of the C0-C1-C2 complex.
• Model validation showed close correspondence with experimental data across various loading conditions.
• The study identified ligaments as the primary influencers of motion within the physiological range.

Conclusions:

• The developed finite element model provides a reliable tool for investigating the biomechanics of the upper cervical spine.
• Ligamentous structures play a dominant role in controlling the kinematics of the human upper cervical spine during physiological movements.
• This research advances the understanding of C0-C1-C2 complex biomechanics, with implications for clinical applications and further research.