Analysis of Dowel Heights after Anterior Cervical Fixation in Cadaveric Cervical Spine

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Korean J Spine 2006;3(2): 61-64.

Analysis of Dowel Heights after Anterior Cervical Fixation in Cadaveric Cervical Spine

Jung-Soo Kim, M.D., Soo-hyun Hwang, M.D., Dong-Ho Kang, M.D., Chul-Hee Lee, M.D., In-Sung Park, M.D,. and Jong-Woo Han, M.D.

Department of Neurosurgery, Gyeongsang National University College of Medicine, Gyeongsang Institute of Health Science, Jinju, Korea

사체 경추에서 전방고정술 후 골편 높이의 분석

김정수^,황수현^,강동호^,이철희^,박인성^,한종우

경상대학교 의과대학교 신경외과학교실

Abstract

Objective: The purpose of this study is to comparison of the Cobb's angle after the cadaveric cervical spine fixation in intact specimen and with different dowel heights(small: 6-mm dowel and large: 9-mm dowel).
Methods: Eight fresh human cadaveric cervical spines(C2-C7) were tested The surrounding musculature was removed from each spine, leaving all ligaments, joint capsules and discs. The superior half of C2 and the inferior half of C7 vertebrae were embedded into the polyester resin. The Cobb's angle at C4 upper end plate and C5 lower end plate were recorded on intact specimens followed by anterior cervical fixation with different dowel heights at C4-C5. Comparison of Cobb's angle in intact, small dowel, and large dowel fixation were calculated and statistically analyzed.
Results: This study has shown that there is significant increase in Cobb's angle with large dowel fixation compare to the intact specimen and small dowel fixation. The averaged values for Cobb's angle at C4-C5 were as follows: -6.91° intact specimen, -8.56° small dowel fixation, -11.43° large dowel fixation. Negative angle values indicate lordosis. In comparison with the intact specimen, the percentage increases were as follows: 23.9% small dowel fixation(p=0.015), 65.4% large dowel fixation(p=0.004).
Conclusions: These results suggest that the Increased Cobb's angle at fixation level may lead to increased rates of lordosis, which could partially explain the decreased rates of disc degeneration adjacent to cervical fusion.

Keywords: Cobb's angle․Different dowel height․Anterior cervical fixation․Lordosis

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