A Biomechanical Evaluation of a Novel Interspinous Process Device: In Vitro Flexibility Assessment and Finite Element...

Area of Science:

• Spinal biomechanics
• Orthopedic device engineering
• Degenerative spinal disease management

Background:

• Interspinous process devices (IPDs) are alternatives for lumbar degenerative pathologies.
• Limited research exists on mechanical failure modes like device failure and spinous process fracture.

Purpose of the Study:

• Develop and evaluate a novel interspinous process device (IPD-NEW).
• Assess its biomechanical characteristics using finite element analysis and cadaveric testing.
• Compare IPD-NEW against existing devices (Wallis, Coflex).

Main Methods:

• Developed a novel interspinous process device (IPD-NEW).
• Conducted finite element analysis and in vitro biomechanical testing on human lumbar specimens (L1-L5).
• Tested four conditions: intact spine, IPD-NEW, Wallis device, and Coflex device.

Main Results:

• IPD-NEW showed comparable segmental range of motion (ROM) to the Wallis device and lower rigidity than Coflex.
• The novel design preserved physiological spinal mobility and enhanced load distribution.
• IPD-NEW significantly reduced facet joint forces, device stress, and spinous process loading, especially under vibration.

Conclusions:

• IPD-NEW effectively preserves spinal mobility while improving load distribution.
• The device may mitigate risks of facetogenic pain, device failure, and spinous process fracture.
• Optimized load redistribution is key to the improved biomechanical profile of IPD-NEW.