Abstract
This chapter presents the results of evaluation and testing of spinal fixation rods. It presents a study that was conducted to analyze the requirements of the fixation device in spinal cord injured patients; to study the pattern of injury in the spinal column resulting from flexion-rotation injuries; to evaluate the fixation capabilities of various devices in the spines; and to select or design a device or combination of devices that fulfill the requirements of reduction and stabilization of the unstable spinal column. The biomechanical model chosen for this study was the porcine spine from pigs 10–12 weeks old. The spinal column was dissected free of the thorax and ileum. The study results indicate that the combination of a Harrington distraction and a Harrington compression rod absorbed greater forces in both compression and tension than did the other combinations although in one or the other mode, other combinations were superior. Thus, the study indicated that for optimal fixation in flexion-rotation and tension, combined Harrington distraction and Harrington compression rods are superior.
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