應(yīng)用兩種不同材質(zhì)融合器行腰椎椎間融合的三維有限元分析
[Abstract]:Background: the development of spinal biomechanics is changing with each passing day, especially in recent years, various new techniques and methods have been developed, pedicle screw fixation and interbody fusion cage (cage) are becoming more and more popular in clinical practice. So that the spinal segment can be stabilized immediately after extensive bone decompression, and through bone grafting to achieve long-term fusion to maintain its normal function. Cage has its own unique advantages, not only increased the fusion rate of vertebral body, reduced the use of bone graft. It can also restore the existing height of intervertebral space, accelerate the fusion rate, and reduce the operation time. Now it has developed into one of the basic techniques of spinal surgery. However, with the increase of the amount of fusion device, there are some examples of fusion failure, such as cage displacement, subsidence and so on. In view of the above failure examples, we have done a lot of experiments and tests on the biomechanical properties of pedicle screw combined with cage [1]. For the pedicle screw experiment, we mainly focus on the analysis of the device anti-fatigue, screw pull-out force and screw force. For interbody fusion cage, the tensile resistance, shear resistance and stability were tested and analyzed. Finite element method can well predict the biomechanical characteristics of screw fixation and cage. It has been widely used in the design and analysis of pedicle screw and fusion cage. Objective: to study the biomechanical characteristics of pedicle screw fixation combined with two different materials cage in L4 / 5 intervertebral fusion by means of finite element analysis (FEM). Methods: a healthy woman who volunteered to participate in the experiment was selected, and the normal spinal L4~L5 segment information was obtained by spiral CT scanning. The scanning images were reconstructed by Mimics and Geomagic software. The three-dimensional model is introduced into the finite element software ANSYS15.0, and then the (INT). Of the L4 / 5 segment 3D finite element model is formed. On the established INT, the model of bilateral pedicle screw combined with two different materials cage was established respectively. The model was Ti (Ti) cage,Mod2 and PEEK (polyether ether ketone) cage.. 500 N preload and 8 N m additional force were added to the two stereoscopic models respectively. After the pre-load and motion additional force of the three-dimensional model were set up, the lumbar vertebrae flexion, extension, left bending, right side bending and left rotation were set. The angular displacement of L4 and 5 segments and the force of bilateral pedicle screws and two different fusion cages were calculated under six right lateral motion conditions. Results the angular displacement of 1: 1 Mod2 was smaller than that of normal under 6 kinds of motion conditions. The maximum stress of Mod1 in stress test is higher than that of Mod2. in 6 kinds of motion conditions. The maximum stress of M 1 and M 2 pedicle screws and cage was smaller than that of other movements. Conclusion: for segments requiring fusion, the pedicle screw system can ensure sufficient strength. The maximum cage stress of peek material is smaller than that of Ti material under the same stable condition. Therefore, the probability of cage finding displacement and settlement of peek material is lower than that of Ti material cage, and the intervertebral fusion rate is also higher. In the experiment, we can find that the stress of the fusion device is small under the condition of the extension motion, so it can be deduced that the stable position of the fusion device is the extension position under the condition of motion.
【學(xué)位授予單位】:青海大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:R687.3
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