A three-dimensional model of the human cervical spine for impact simulation

Area of Science:

• Biomechanics
• Spinal Engineering
• Injury Mechanics

Background:

• The cervical spine's complex structure presents challenges for accurate biomechanical modeling.
• Existing models often struggle to replicate spinal stability under various acceleration planes.

Purpose of the Study:

• To develop a validated three-dimensional analytical model of the cervical spine.
• To accurately represent spinal components like intervertebral disks, facet joints, ligaments, and muscles.

Main Methods:

• Modeled cervical vertebrae and head as rigid bodies connected by deformable elements.
• Introduced a novel pentahedral continuum element for articular facets to ensure stability.
• Incorporated over 100 muscle elements representing 22 major neck muscle groups.
• Simplified the spine and body below T1.
• Validated the model against published experimental data for frontal and sideways impacts.

Main Results:

• The model effectively simulates cervical spine stability under lateral and frontal accelerations.
• Demonstrated the influence of the stretch reflex response on head and neck dynamics during moderate acceleration impacts.
• Validated model predictions against experimental data for impact simulations.

Conclusions:

• The developed 3D analytical model provides a robust tool for studying cervical spine biomechanics.
• The model accurately captures spinal stability and the effects of muscle reflexes during acceleration.
• This research contributes to a better understanding of whiplash injury mechanisms and prevention.