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Biomechanical evaluation of an interspinous stabilizing device, Locker
Chan Shik Shim1, Seoung Woo Park, Sang-Ho Lee
1Department of Neurosurgery, Wooridul Spine Hospital, Seoul, Korea. shimcs@wooridul.co.kr
Spine
|October 17, 2008
Summary
The Locke dynamic interspinous device stabilizes the spine and reduces disc pressure in intact and destabilized states. However, it does not provide stabilization in axial rotation for destabilized spines.
Area of Science:
- Biomechanical study
- Spinal biomechanics
- Orthopedic device evaluation
Background:
- Limited biomechanical data exists for the novel dynamic interspinous device, Locke.
- Interspinous devices are used to manage spinal instability.
Purpose of the Study:
- To evaluate the biomechanical properties of the Locke dynamic interspinous device.
- Assess the device's effect on spinal motion segment stability and intradiscal pressure.
Main Methods:
- Biomechanical testing on five human cadaveric lumbar spine specimens (L2-S1).
- Sequential testing included intact state, ligament removal, device application, segment destabilization, and device reapplication.
- Range of motion (ROM) and intradiscal pressure were measured.
Main Results:
- The Locke device significantly reduced ROM in extension and flexion in intact spines.
- In destabilized segments, it reduced ROM in all directions except axial rotation.
- Intradiscal pressures in the posterior anulus and central nucleus were significantly decreased.
Conclusions:
- The Locke device demonstrates significant spinal stabilizing effects in intact and destabilized states.
- It effectively reduces intradiscal pressures without affecting adjacent segments.
- Clinical application should consider the device's lack of stabilization in axial rotation for destabilized spines.
