Orhan Suleyman Nazif, Ozyazicioglu Mehmet Hamit
Department of Civil Engineering, Faculty of Engineering and Architecture, Erzurum Technical University, Erzurum, Turkey.
Department of Civil Engineering, Faculty of Engineering, Ataturk University, Erzurum, Turkey.
Proc Inst Mech Eng H. 2019 Dec;233(12):1282-1291. doi: 10.1177/0954411919880703. Epub 2019 Oct 8.
The main purpose of this study is to develop a validated three-dimensional finite element model of sternum closure techniques. For this aim, the finite element method analysis results of three closure methods were compared with experimental test results. Also, three more closure techniques are simulated numerically to study the effect of the number of wires used in the manubrium and xiphoid regions. A three-dimensional model of polyurethane sternum foam was created based on computed tomography images. Six different closure techniques using steel wire, steel bands and ZipFix bands were modeled on the sternum and transferred into a three-dimensional finite element model. The sternum was modeled as an isotropic bilinear-elasto-plastic material, and nonlinear contact conditions were applied. The models were analyzed under lateral distraction loading, and load-displacement curves were obtained from displacements at the incision line. Allowable loads and stiffness values of the methods were evaluated from these curves. The results showed the importance of the including material as well as geometric nonlinearities in the simulations to obtain realistic results from the numerical analyses. Also, the analyses showed that closures that include steel or ZipFix bands are superior to conventional wiring, and addition of a single wire at the manubrium and xiphoid regions significantly improved the efficiency of the closure techniques.
本研究的主要目的是建立一个经过验证的胸骨闭合技术三维有限元模型。为此，将三种闭合方法的有限元方法分析结果与实验测试结果进行了比较。此外，还对另外三种闭合技术进行了数值模拟，以研究在胸骨柄和剑突区域使用钢丝数量的影响。基于计算机断层扫描图像创建了聚氨酯胸骨泡沫的三维模型。在胸骨上对使用钢丝、钢带和ZipFix带的六种不同闭合技术进行建模，并将其转换为三维有限元模型。胸骨被建模为各向同性双线性弹塑性材料，并应用了非线性接触条件。在侧向牵张载荷下对模型进行分析，并从切口线处的位移获得载荷-位移曲线。从这些曲线评估了这些方法的允许载荷和刚度值。结果表明，在模拟中纳入材料以及几何非线性对于从数值分析中获得实际结果的重要性。此外，分析表明，包括钢带或ZipFix带的闭合方法优于传统的钢丝固定，并且在胸骨柄和剑突区域增加一根钢丝可显著提高闭合技术的效率。
