The biomechanical research on the changes of pressures in the C7/T1 intervertebral space after C5/6 cervical artificial disc replacement

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Author:
LI Kang-hua(Department of Orthopaedics,Xiangya Hospital,Center South University,Changsha 410000,China)
LI Si-hong(Department of Orthopaedics,Xiangya Hospital,Center South University,Changsha 410000,China)
LI Guo-jun(Department of Orthopaedics,Xiangya Hospital,Center South University,Changsha 410000,China)
ZHANG Jun(Department of Orthopaedics,Xiangya Hospital,Center South University,Changsha 410000,China)
HUANG Yue-pin(Department of Orthopaedics,Xiangya Hospital,Center South University,Changsha 410000,China)
Journal Title:
JOURNAL OF CHINESE PHYSICIAN
Issue:
Volume 11, Issue 03, 2009
DOI:
Key Word:
Intervertebral disk/SU;Cervical spondylosis/SU;Cervical vertebrae/SU;Biomechanics

Abstract: Objective To explore the stress changes of C7/T1 intervertebral space pre-and post C5/6 discectomy and artificial disc replacement.Method Eleven healthy adult fresh muhisegmental cadaveric cervical spine segments were utilized in this investigation and biomechanically evaluated under the following C5/6 conditions:intact spine,discectomy,and Bryan Disc prosthesis implantation.The load,of neutrality and pure moments of axial,flexion,extension,and lateral bending were applied on each group.The stress changes of the inferior (C7/T1)interverlebral space was detected by modified cyclo-shaped miniature transducer.Result Under axial,anteflexion,and lateral bending loading,the discectomy indicated a significant increase in the stress of the inferiorer(C7/T1)intervertebral space,compared to intact condition and CADR(P<0.05).Under extension loading,the discectomy indicated an increase in the stress of the inferiorer(C7/T1)intervertebral space,compared to intact condition(P>0.05).Under axial,flexion,extension and lateral bending loading,the Bryan Disc prosthesis implantation indicate minor increase of the stress in the inferior(C7/T1)intervertebral space to intact condition(P>0.05).Conclusion There was no difference between the C5/6 ADR and intact spine group.The discectomy of the Cs/6 can increase the stress of the C7/T1 intervertebral spaoe.

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