Faculty of Engineering, University of Kragujevac, Kragujevac, Serbia.
Bioengineering Research and Development Center, Kragujevac, Serbia.
Technol Health Care. 2024;32(2):1123-1133. doi: 10.3233/THC-230692.
In order to ensure the proper function of the cementless hip implant, the connection between the femoral bone and the implant has to be as strong as possible. According to experimental studies, implants with a rough surface reduce micro-movements between femoral bone and implant, which helps form a stronger connection between them.
The goal of this study was to analyze how half-cylinder surface topographies of different diameter values affect shear stress values and their distribution on the surface of the hip implant and trabecular femoral bone.
Nine models with different half-cylinder diameter values (200 μm, 400 μm, and 500 μm) and distances between half-cylinders were created for the analysis using the finite element method. Each model consisted of three layers: implant, trabecular, and cortical femoral bone.
For all three diameter values, the highest shear stress value, for the implant layer, was located after the first half-cylinder on the side where force was defined. For the trabecular bone, the first half-cylinder was under lower amounts of shear stress.
If we only consider shear stress values, we can say that models with 400 μm and 500 μm diameter values are a better choice than models with 100 μm diameter values.
为了确保无水泥髋关节植入物的正常功能，股骨与植入物之间的连接必须尽可能牢固。根据实验研究，表面粗糙的植入物可减少股骨与植入物之间的微运动，有助于在它们之间形成更强的连接。
本研究的目的是分析不同直径值的半圆柱表面形貌如何影响髋关节植入物和小梁股骨表面的剪应力值及其分布。
使用有限元法为分析创建了九个具有不同半圆柱直径值（200μm、400μm 和 500μm）和半圆柱之间距离的模型。每个模型由三层组成：植入物、小梁和皮质股骨。
对于所有三个直径值，在定义力的一侧，植入物层的最高剪应力值位于第一个半圆柱之后。对于小梁骨，第一个半圆柱承受的剪应力较小。
如果仅考虑剪应力值，可以说直径值为 400μm 和 500μm 的模型比直径值为 100μm 的模型是更好的选择。
