杂交术治疗多节段颈椎病后生物力学有限元分析

Abstract

Abstract:

Objective　To investigate the stress patterns of a hybrid technique combined cervical ACDR and ACDF in treating multilevel cervical disease by Mobi-C prosthesis.　Methods　A previously validated FE model of a subaxial cervical spine was used. The skull load of 74N and torsion preload of 1.8Nm were simulated on C2. Two hybrid models and a three-level fusion model were simulated to analyze the prosthesis including endplate and inlay and the facet joint force of all the segments.　Results　⑴ The stress on the superior endplate of Mobi-C prosthesis was higher than the inferior endplate in the two hybrid models. ⑵ The high stress concentrated around the middle and posterior regions of the endplate. The maximum stress in M1 was 79.4Mpa while in M2 was 70.9Mpa. The peak stress concentrated around the bilateral parts of the core. The maximum stress in M1 was 11.6Mpa while in M2 was 14.4Mpa. ⑶ Comparison of three reconstruction models with intact model, the facet joint force showed decrease in the fusion segment but increase in ACDR segment. The facet joint at adjacent segments of operation was significant increased in the three-level fusion model than hybrid models.　Conclusions　For the application of the hybrid technique by Mobi-C prosthesis in treating multilevel cervical disease, the result of the study showed that the hybrid technique has a low incidence of subsidence and can effectively restore pressure of facet joint compared with three-level ACDF.

Key words: Cervical artificial disc replacement, Hybrid technique, Mobi-C, Finite element analysis

CLC Number:

R318.01

ZHENG Hu-Chen, MIN Shao-Xiong, ZHANG Li, ZHANG Hui, CAO Yan-Lin, DUAN Yang, JIN An-Min. Biomechanic effects of hybrid technique on treating multilevel cervical disease by Mobi-C prosthesis: a finite element model analysis[J]. Chinese Journal Of Clinical Anatomy, 2012, 30(2): 221-224.

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Biomechanic effects of hybrid technique on treating multilevel cervical disease by Mobi-C prosthesis: a finite element model analysis

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