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WANG Hongwei,LI Changqing,ZHOU Yue.Biomechanical study of transpedicular fixation via injured vertebra plus connector for short-segment instrumentation of the spinal fracture[J].Chinese Journal of Spine and Spinal Cord,2010,20(9):745-748.

Biomechanical study of transpedicular fixation via injured vertebra plus connector for short-segment instrumentation of the spinal fracture

Received:April 26, 2010 Revised:July 19, 2010

English Keywords:Spinal fracture Pedicular screw Fixation of the fractured vertebra Stability

Fund:

Author Name	Affiliation
WANG Hongwei	Department of Orthopaedics，Xinqiao Hospital of Third Military Medical University，Chongqing，400037，China
LI Changqing	第三军医大学附属新桥医院骨科 400037 重庆市
ZHOU Yue	第三军医大学附属新桥医院骨科 400037 重庆市
赵卫东	南方医科大学生物力学实验室 510000 广州市

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English Abstract:

【Abstract】 Objective：To investigate the biomechanical stability of transpedicular fixation via injured vertebra plus connector for short-segment instrumentation of the spinal fracture.Method：L3 vertebral body fracture model were made on 5 fresh calf lumbar spine specimens，the stability of the L2-L4 segment with regard to intact specimens（control group），fractured model specimens（fracture group），transpedicular fixation via injured vertebra（6-screws construct） and transpedicular fixation via injured vertebra plus connector（6-screws plus connector construct） were tested for the range of motion（ROM） in flexion-extension，lateral bending and axial rotation.Result：The ROM of L2-L4 in flexion-extension，lateral bending and axial rotation of the fracture group was more than the intact specimens，which showed significant difference（P<0.05）.The ROM in flexion-extension，lateral bending and axial rotation of 6-screw and 6-screws plus connector constructs was smaller than those of the fracture group（P<0.05）.Two instrumentation group exhibited a smaller ROM in flexion-extension and lateral bending compared with the intact specimens（P<0.05）.There was no siginificant difference in the flexion-extension and lateral bending ROM between two instrumentation groups（P>0.05），but 6-screw plus connector constructs had smaller axial rotation ROM than that 6-screws constructs alone（P<0.05）.Conclusion：Transpedicular fixation via injured vertebra can enhance the biomechanical stability of the short-segment pedicle fixation system.Additionally，transpedicular fixation via injured vertebra plus connector is superior than the single 6-screw construct in providing axial rotation stability.

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