A novel posture control device to induce high-rate complex loads for spine biomechanical studies

Area of Science:

• Biomechanics
• Spinal Engineering
• Human Factors Engineering

Background:

• Current spine research often uses simplified sagittal and planar loads.
• Real-world scenarios like autonomous vehicles induce complex, multiplanar spinal forces.
• Existing methods do not adequately replicate these non-standard postures and loads.

Purpose of the Study:

• To develop and demonstrate a posture control device capable of inducing multiplanar loads on human cadaver spinal columns.
• To enable realistic biomechanical testing that reflects modern environmental demands.
• To advance the understanding of spinal injury mechanisms under complex loading conditions.

Main Methods:

• Designed a device with six degrees-of-freedom for specimen positioning (x-y table, lift, rotation).
• Incorporated two superior end attachments for varied force/moment induction (direct piston attachment or slider-crank mechanism).
• Validated the device using thoracolumbar and head-neck cadaver specimens under dynamic loading rates.

Main Results:

• The device successfully induced combined forces and moments in the thoracolumbar spine.
• Complex moments were applied to the head-neck column.
• Demonstrated dynamic loading capabilities simulating real-world scenarios.

Conclusions:

• The developed posture control device effectively simulates multiplanar spinal loading and non-standard postures.
• This technology can significantly advance the study of spinal biomechanics and injury criteria development.
• Enables more accurate research for safety in autonomous systems and military applications.