Cervical spinal cord deformation during simulated head-first impact injuries

Area of Science:

• Biomechanics
• Neuroscience
• Orthopedics

Background:

• The relationship between spinal column injuries and spinal cord damage is not fully understood.
• Previous research has focused on spinal canal occlusion, with limited quantification of actual spinal cord compression or deformation.
• The spinal cord's viscoelastic properties may influence injury mechanics differently than an empty canal.

Purpose of the Study:

• To develop a novel method for visualizing and quantifying spinal cord deformation during simulated cervical spine injuries.
• To correlate observed spinal cord deformations with theoretical neurological outcomes based on existing data.

Main Methods:

• Utilized ex vivo human cervical spine specimens (N=6) subjected to dynamic head-first impact.
• Employed a radiodense, biofidelic surrogate spinal cord imaged with high-speed cineradiography (1000 fps).
• Measured dorsal-ventral cord diameter at 1.5mm increments to quantify deformation.

Main Results:

• Developed a method to visualize and quantify spinal cord deformation in response to impact.
• Determined theoretical neurological recovery probabilities ranging from 8% (atlantoaxial dislocation) to 95% (mid-cervical hyperextension).
• Produced clinically relevant spinal column fracture patterns in the specimens.

Conclusions:

• Quantifiable spinal cord deformation can be measured during simulated cervical spine injuries.
• The degree of spinal cord deformation is a critical factor in predicting neurological outcomes.
• This methodology provides a basis for further research into spinal cord injury biomechanics and treatment.