Abstract
Biomechanical study: This study was designed to investigate the biomechanical effects of interbody screwing on the motion segment using canine lumbar vertebrae. Each specimen consisted of four types of functional spinal units (FSU). The first specimen was intact FSU; The second had bilateral facetectomies and resection of the interspinous ligament; The third had disc decompression added to the second specimen; The fourth specimen had, in addition to the third one, two screws inserted in the disc space. Flexion, extension, lateral bending, axial rotation were applied to each specimen. Stiffness of the FSU was decreased in all injured specimens throughout all movement. After Interbody screwing, stiffness improved throughout the range of movenent more than Intact FSU. However during in excessive flexion, the posterior longitudinal ligament and annulus fibrosus were torn and displacement was increased.Clinical study: Four patients were treated using the T. F. C system for unstable spines including disc herniation. These cases showed an immediate increase in stability at the operated segment. Low back pain was improved in all cases. However, bone union could not be confirmed with MRI and CT.Conclusion: This study suggests that the T. F. C system can maintain or enlarge disc height, and immediately increase segmental stability.
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