Chinese Journal of Tissue Engineering Research ›› 2011, Vol. 15 ›› Issue (17): 3089-3092.doi: 10.3969/j.issn.1673-8225.2011.17.013

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Instable Jefferson fracture fixed with the single or double side atlantoaxial pedicle screw-rod system: A biomechanical study

Jiang Xiao-hong1, Xiao Zeng-ming1, Wen Jie-ming2, Tang Lin3, Jiang Xiong-jian1   

  1. 1Department of Spinal and Bone Surgery, First Affiliated Hospital of Guangxi Medical University, Nanning  530021, Guangxi Zhuang Autonomous Region, China
    2College of Mechanical Engineering, Guangxi University, Nanning  530004, Guangxi Zhuang Autonomous Region, China
    3Department of Bone Surgery, People’s Hospital of Guangxi Zhuang Autonomous Region, Nanning  530000, Guangxi Zhuang Autonomous Region, China
  • Received:2010-12-10 Revised:2011-02-24 Online:2011-04-23 Published:2011-04-23
  • Contact: Xiao Zeng-ming, Master, Chief physician, Department of Spinal and Bone Surgery, First Affiliated Hospital of Guangxi Medical University, Nanning 530021, Guangxi Zhuang Autonomous Region, China
  • About author:Jiang Xiao-hong★, Studying for master’s degree, Department of Spinal and Bone Surgery, First Affiliated Hospital of Guangxi Medical University, Nanning 530021, Guangxi Zhuang Autonomous Region, China 285278504@qq.com

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Abstract:

BACKGROUND: At present, posterior atlanto-axial pedicle screws have a trend to replace Magerl technology, and become the new standard operation for vertebral instability.
OBJECTIVE: To evaluate the mechanical stability of the single or double side atlantoaxial pedicle screw-rod system for treatment of instable Jefferson fracture, in order to provide the basis for clinical application.
METHODS: After gross observation and X-radiography confirmation of the specimen’s integrity and no osseous abnormality, six adult wet-cadvaveric spinal (C0-4) specimens were used to test the biomechanical stability. The specimens were intact, after instable Jefferson fracture and transverse ligament section, and after stabilization fellow the two techniques: the single or double side atlantoaxial pedicle screw-rod system. The three dimensional movements of C1-2 were recorded though photogrametry with a pure moment of 1.53 N·m. The range of motion (ROM) of each specimen in two fixations was calculated. Statistical analysis was performed with one-way analysis of variance, Fish’s least significant difference test to evaluate the immediate stability of the fixation with the two methods.
RESULTS AND CONCLUSION: In flexion, lateral flexion and axial rotation of sports, the ROM in the single side atlantoaxial pedicle screw-rod system group was significantly more than that in the double side atlantoaxial pedicle screw-rod system group (P < 0.05). In the treatment of instable Jefferson fracture, the double side atlantoaxial pedicle screw-rod system can provide excellent stability; Fixed effect of the single side atlantoaxial pedicle screw-rod system is not good, and its anti-rotation ability is poor and cannot satisfy the demands of the strengthen stability, graft fusion, which should avoid to be used alone.  

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