摘要
目的比较大、小直径钛网植骨对颈椎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Ansys 9.0软件的建模功能,建立大、小直径钛网植骨钢板固定手术模型。分别对模型施加80 N预载荷及1.8 Nm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von Mises应力,然后进行比较。结果在各种工况下,大直径钛网植骨C4下终板-钛网界面(七个点的平均值分别为6.71、7.19、9.04 Mpa)和C6上终板-钛网界面各个接触点的应力(七个点的平均值分别为7.61、8.23、9.97 Mpa)分别小于小直径钛网植骨C4下终板-钛网界面(七个点的平均值分别为9.05、9.81、12.06 Mpa)和C6上终板-钛网界面相应接触点的应力(七个点平均值分别为10.65、11.59、14.26 Mpa)。结论大直径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,但应用于临床有待于进一步研究。
Objective To study the mechanical changes on cage-endplate interface between different size of the titanium mesh cages with larger or small diameter 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 and plate after C5 corpectomy according to the applied titanium mesh cage conditions： Φ12 mm titanium mesh cage without internal end ring（L-）,Φ10 mm titanium mesh cage without internal end ring（S-）,von Mises stress of seven parts on the superior and inferior cage-endplate interface was comparatively analyzed between model with L-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（mean stress：6.71、7.19、9.04）Mpa and inferior cage-endplate interface（mean stress：7.61、8.23、9.97）Mpa in the model with L-was smaller than that（mean stress：7.61、8.23、9.97,and 10.65、11.59、14.26）Mpa in the model with S-under the three loading conditions.Conclusions A titanium mesh cage with larger diameter produces a significant decrease of the cage-endplate interface stress and lower incidence of titamium mesh cage subsidence after anterior cervical corpectomy.But it would be proved further if it were used in clinical practice.
出处
《颈腰痛杂志》
2011年第5期323-327,共5页
The Journal of Cervicodynia and Lumbodynia
基金
泉州市科技优秀人才专项经费资助项目(编号:07A20)
泉州市局资助项目(编号:2006Z29)
关键词
颈椎
椎体次全切除
终板
钛网
下沉
生物力学
有限元法
cervical spine
corpectomy
endplate
titanium mesh cage
subsidence
biomechanics
finite elememt analysis
