Journal of Jilin University Medicine Edition ›› 2016, Vol. 42 ›› Issue (03): 565-569.doi: 10.13481/j.1671-587x.20160328

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Finite element analysis on lumbar intervertbral disc slight degeneration treated by expanded vertebra interbody fusion cage

WANG Yu, MU Shangqiang, MEI Jiwen, SUN Shuang   

  1. Department of Orthopedics, Affiliated Hospital, Jilin Medical College, Jilin 132013, China
  • Received:2015-09-23 Published:2016-06-17

Abstract:

Objective: To establish the expended vertebra interbody fusion cage (EVIFC) and finite element analysis of L4-5 and to analyze the influence of EVIFC insertion in the biomechanical parameters of lumbar spine,and to provide the biomechanical evidence for its clinical application. Methods: According to the umbar CT scan data of healthy adult male people, the normal L4-5 lumbar spine finite element model was established.In this model,the L4-5 intervertebral disc slight degeneration was simulated,and the 3D model was implanted with EVIFC.Under flexion,lateral bending,and rotation loading conditions,the stability of lumbar spine model before and after EVIFC implantion,the pressure of the intervertebral disc,endplate pressure and small joint loading changes were analyzed. Results: After the insertion of EVIFC,the stress in end-plate,nucleus and small joint of the L4-5 level was decreased. In flexion,the mean pressure values in the end-plate and nucleus of the degeneration model were 6.162 0 and 0.201 6 MPa,and the small joint load was 32.8 N.After implantation of EVIFC ,they were 3.526,0.107 MPa,and 8.5 N,respectively.The consistent results occurred in another two loading conditions,As for the adjacent levels,compared with degeneration model,the stress in end-plate and nucleus were decreased at the L4-5 level.The mean stress in the annulus of L4-5 was increased slightly. Conclusion: EVIFC has effect on the stability of slightly degenerative lumber spine which can meet the needs of human biomechanics,and it is a suitable and new lumbar fusion device.

Key words: lumbar spine, vertebra interbody fusion cage, biomechanics, finite element analysis

CLC Number: 

  • R318.08