Dynamic Spine Simulator

A novel testing setup for dynamic and long-term evaluation of spinal biomechanics and implant performance.

To better understand the implications of spinal injuries and disorders, our research aims to improve knowledge of bone and disc pathology.  We also evaluate new surgical techniques and implants for degenerative, deformative, and traumatic spine conditions. To achieve this, we develop motion and loading simulators that allow experiments under physiological conditions to analyse spinal construct failure.

Previous tests often analysed static or quasi-static motion, where the spine was moved slower than physiological speeds and for only a few cycles. This limits the analysis and attenuates viscoelastic effects. To address long-term behaviour and dynamic motion, we developed a novel dynamic testing system.

The novel testing device is a dynamic spine simulator capable of testing a spinal segment in six degrees of freedom, applying all three rotational torques and axial compression simultaneously. Segments are loaded at physiological speeds, capturing viscoelastic effects. Its speed also enables long-term tests that can mimic up to six months of relevant spinal motion. An automated fogging system keeps specimens moist during long-term testing, preserving their load characteristics. A six-degree-of-freedom load cell measures all forces and torques applied to the segment, allowing detailed analysis of segment behaviour.

This novel setup provides insight into implant longevity, enhances understanding of spine biomechanics, and improves the quality of surgical techniques before in vivo testing.