The Spinal Cord's natural motion is recovered using the Motion Preservation Devices. Pathologies that cannot be treated with the standard fusion techniques can be treated with motion preservation devices. Structure changes in the spinal cord are caused by spinal disorders including bone expansion and thickening of the band of tissues in the spine. The elderly are frequently affected by spinal stenosis. These tools support the patient's ability to control the spinal cord's flexibility and mobility.

Motion Preservation Devices can be divided into four categories: whole disc replacement, prosthetic nucleus replacement, posterior dynamic devices, and facet replacement. Theoretically preventing adjacent level deterioration, motion preservation is an alternative to spinal arthrodesis that is intuitively appealing. For the vast majority of implants, there is no information on the prosthesis's long-term stability, endurance, or strength. Compared to the intervertebral disc, maintaining motion in the posterior components of the spine is probably a simpler task.

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