FINITE ELEMENT MODEL OF STABILIZED CANINE CERVICAL SPINE: TITANIUM IMPLANT

本研究旨在将钛合金接骨板 钛合金金属离子释放应变与螺钉接骨板界面 从狗模型的颈椎后路植入物。 据信 注入应变的大小会影响金属的量 释放到周围的组织，反过来， 组织中材料的浓度将影响植入物的 生物性能。 各部分之间的相对微动 植入物可以加速金属从植入物中的释放。 作为 本研究的一部分，三维有限元模型 在犬颈椎节段（C3-C6）中，板和螺钉将 发展。 模型精度将通过 收敛性测试，并将通过建模台架测试进行验证 带应变计植入物的离体样本的加载方案。 的 然后，将尽可能接近生理学加载模型 描述功能应变分布的条件。 接触 接骨板和骨以及接骨板和螺钉之间的应力将 考察 最后，将有限元模型的结果 相比，金属浓度的分布中发现， 组织.

This investigation intends to correlate titanium alloy plate strain and screw plate interface with titanium alloy metal ion release from posterior cervical spine implants in a dog model. It is believed that the magnitude of implant strain can influence the amount of metal released into the surrounding tissues and, in turn, that the concentration of material in the tissue will influence the implant's biological performance. Relative micromotion between various parts of the implant may accelerate the release of metal from the implant. As part of this investigation, a three-dimensional finite element model of the canine cervical spine segments(C3-C6), plates and screws will be developed. The model accuracy will be established through a convergence test, and it will be validated by modeling bench test loading schemes of ex-vivo specimens with strain gaged implants. The model will then be loaded as closely as possible to physiological conditions to depict the functional strain distributions. Contact stresses between the plate and bone and plate and screws will be examined. Finally, the results of the finite element model will be compared to the distributions of metal concentration found in the tissue.