Evaluation of effectiveness of a facet wiring technique: Anin vitro biomechanical investigation |
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Authors: | Vijay K Goel Charles R Clark Kurt G Harris Y E Kim Kary R Schulte |
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Institution: | (1) University of Iowa, Iowa, USA;(2) Department of Biomedical Engineering, College of Engineering, University of Iowa, 52242 Iowa City, IA |
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Abstract: | The effects of facet wiring procedure commonly used for stabilizing cervical spines after laminectomy or bilateral facet dislocation on the motion behavior of whole cervical spines are investigated using a Selspot II® system. A fresh human ligamentous intact specimen was potted at T1/T2 vertebra and clinically relevant loads applied to the topmost vertebra (C2) of the specimen. The resulting three rotational components of each of the five vertebral bodies (C3-C7) were recorded. Specimen was injured to mimic total laminectomies at C5 and C6 vertebral levels and tested again. The injured specimen was stabilized, using a facet wiring construct, across C4-C7 segment before testing for the final time. The injured specimens, compared to the intact specimens, demonstrated an increase in flexion-extension of about 10%. Facet wiring imparted stability to the cervical spine by stiffening segments up to roughly four times intact values. |
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