有、无垫片钛网植骨对终板-钛网界面应力分布影响的比较  

A fmite element analysis of comparision study on mechanical changes in cage-endplate interface between titanium mesh cages with or without augmentation of internal end ring system after anterior cervical corpectomy

作　　者：苏再发[1] 贾连顺[1] 张美超[2] 陈雄生[1] 李家顺[1] 吴培增[3] 

机构地区：[1]第二军医大学附属长征医院骨科,上海200003 [2]南方医科大学解剖教研室广东省医学生物力学重点实验室 [3]福建省泉州市中医院骨科

出　　处：《中华实验外科杂志》2009年第12期1696-1698,共3页Chinese Journal of Experimental Surgery

基　　金：泉州市优秀人才专项经费资助项目（07A20）;泉州市科技局资助项目（2006229）

摘　　要：目的比较有、无垫片钛网植骨对颈椎前路椎体次全切除减压终板-钛网界面应力分布的影响。方法利用Ansys9．0软件的建模功能，建立有、无垫片钛网植骨钢板固定手术模型。分别对模型施加80N预载荷及1．8Nm力矩，使其产生轴向压缩、前屈和后伸运动，选取终板-钛网界面7个接触点，提取各个点的yonMises应力，然后进行比较。结果在各种工况下，有垫片钛网植骨C4下终板．钛网界面（5．43、5．74、6．88）Mpa和C6上终板．钛网界面7个各个接触点的应力（7．61、8．23、9．97）Mpa分别小于无垫片钛网植骨C4下终板-钛网界面（7．46、8．12、10．04）Mpa和C6上终板-钛网界面相应接触点的应力（10．65、11．59、14．27）Mpa。结论有垫片钛网植骨能够降低终板-钛网界面的应力，避免终板应力的过度集中，从而降低钛网下沉的发生率。Objective To study the mechanical changes in cage-endplate interface between titanium mesh cages with or without augmentation of internal end ring system after anterior cervical corpectomy by finite element analysis. Methods Based on the intact finite element model （FE/Intact） , two models were generated by simulating anterior cervical titanium mesh fusion cage and plate after C5 corpectomy according to the applied titanium mesh cage conditions ： ФP10 mm titanium mesh cage without internal end ring （S-） and ФP10 mm titanium mesh cage with internal end ring （S ＋ ）. yon Mises stress of seven parts on the superior and inferior cage-endplate interface was comparatively analyzed between model with S-and model with S ＋ after loading of each model being simulated using multidirectional moment loads of 1.8 Nm combined with a compressive preload of 80 N in compression, flexion and extension. Results The stress on the superior （7.61,8.23,9.97） Mpa and inferior cage-endplate interface （5.43,5.74,6.88） Mpa in the model with S-was bigger than that （ 10.65,11.59,14.27 and 7.46,8.12,10.04） Mpa in the model with S ＋ under the three loading conditions. Conclusion A titanium mesh cage with internal end ring produces a significant decrease of the cage-endpiate interface stress and lower incidence of titamium mesh cage subsidence after anterior cervical corpectomy.

关 键 词：颈椎 椎体切除术 终板 钛网 

分 类 号：R687.3[医药卫生—骨科学]