Faria Fernando Ferraz, Gruhl Carlos Eduardo Miers, Ferro Rafaela Rebonato, Rached Rodrigo Nunes, Soni Jamil Faissal, Trevilatto Paula
Escola de Ciências da Vida, Departamento de Ciências da Saúde, Pontifícia Universidade Católica do Paraná (PUCPR), Curitiba, Paraná, Brazil.
Departamento de Ortopedia e Traumatologia, Hospital Universitário Cajuru, Pontifícia Universidade Católica do Paraná (PUCPR), Curitiba, Paraná, Brazil.
Rev Bras Ortop (Sao Paulo). 2021 Feb;56(1):36-41. doi: 10.1055/s-0040-1721368. Epub 2021 Feb 19.
To virtually prototype a device for external circular fixation of long bone fractures with controlled dynamization made of two different materials and predict their mechanical behavior by using the finite element analysis (FEA) method. A software was used for 3D modeling two metal parts closely attached by a sliding dovetail joint and a high-density silicone damper. Distinctive FEAs were simulated by considering two different materials (stainless steel or titanium), modes (locked or dynamized) and loading conditions (static/point or dynamic/0.5 sec) with uniform 150 kg axial load on top of the device. The finite elements (FEs) model presented 81,872 nodes and 45,922 elements. Considering stainless steel, the maximum stress peak (140.98 MPa) was reached with the device locked under static loading, while the greatest displacement (2.415 × 10 mm) was observed with the device locked and under dynamic loading. Regarding titanium, the device presented the maximum stress peak (141.45 MPa) under static loading and with the device locked, while the greatest displacement (3.975 × 10 mm) was found with the device locked and under dynamic loading. The prototyped device played the role of stress support with acceptable deformation in both locked and dynamized modes and may be fabricated with both stainless steel and titanium.
为了虚拟原型化一种用于长骨骨折外固定的可控动力化装置，该装置由两种不同材料制成，并使用有限元分析（FEA）方法预测其力学行为。使用软件对通过滑动燕尾榫接头紧密连接的两个金属部件和一个高密度硅胶阻尼器进行三维建模。通过考虑两种不同材料（不锈钢或钛）、模式（锁定或动力化）和加载条件（静态/点加载或动态/0.5秒），在装置顶部施加150千克均匀轴向载荷，模拟了不同的有限元分析。有限元（FE）模型有81,872个节点和45,922个单元。考虑不锈钢时，在静态加载且装置锁定的情况下达到最大应力峰值（140.98兆帕），而在装置锁定且动态加载的情况下观察到最大位移（2.415×10毫米）。对于钛，在静态加载且装置锁定的情况下装置呈现最大应力峰值（141.45兆帕），而在装置锁定且动态加载的情况下发现最大位移（3.975×10毫米）。原型装置在锁定和动力化模式下都起到了应力支撑作用，变形可接受，并且可以用不锈钢和钛制造。
