摘要
目的设计一种新型的"肾形"n-HA/PA66腰椎间融合器(cage),通过三维有限元分析,研究其在经椎间孔腰椎椎间融合术(TLIF)中的生物力学特性。方法建立正常人体L3-L5节段三维模型,模拟经椎间孔腰椎椎间融合术,采用有限元分析方法进行应力分析,比较肾型与子弹头型n-HA/PA66腰椎间融合器应力分布的差异。结果在前屈、后伸、左右旋转工况下两种不同cage的TLIF手术模型对比,子弹头型cage最大应力分别为32.8、32.8、31.4、31.3、32.8、34.2 MPa,肾型cage最大应力分别为13.2、11.4、10.9、10.1、11.7、11.1 MPa;而且肾型cage应力集中区域小于子弹头型cage。结论肾型n-HA/PA66腰椎间融合器固定的椎体应力分布小而均匀,理论上可有效降低cage沉降率。
Objective To design a new ＂Kidney＂ like n-HA/PA66 lumbar fusion cage and analyze the biomechanics of this cage in transforaminal lttmbar interbody fusion （TLIF） using the method of finite element analysis. Methods Develop a normal intact three validated model of L3-L5 lumbar segments, compare the biomechanical difference between new kidney-liked cage and usual bullet-liked cage by simulating the TLIF using finite element analysis. Results Compare different TLIF model with the two kinds of cage, the max stress of old cage and new cage was 32.8,32.8,31.4,31.3,32.8,34.2MPa and 13.2 11.4, 10.9, 10.1,11.7 11.1MPa, separately. And the new cage＇ s area of stress concentration was smaller than the old cage＇ s. Conclusion This brand new cage has good biomechanical stability and reduced stress of the cage-endplate interface. This may reduce the sedimentation rate of cage.
出处
《中国临床解剖学杂志》
CSCD
北大核心
2014年第1期67-71,共5页
Chinese Journal of Clinical Anatomy
基金
国家高新技术研究发展("863")(2002AA326020)
重庆市科学技术委员会科技攻关项目(cstc2012gg-yyjs10018)
