The purpose of this study is to examine the effects of screw preload values on the bone-plate system. The preload value was taken differently in the literature range from 50 N to 3000 N. These preload value were examined in this study. The finite element method was used to calculate the strain and stress on the models. The long bone, plate and screws were modeled as 3D using CAD software. The finite element models were created using Ansys Workbench software. The convergence and validation study were made for the correct results. The 400 N axial load was applied to the proximal end of bone. The distal end of the bone fixed for boundary condition. The preload values were applied to the screws differently. The results of the finite element analysis were compared and evaluated. The results showed that when the preload values increased, the von Mises stresses and strains on the bone and plate system increased. The critical preload value of the screw is the 500 N. The upper values of this critical value can be damaged bone and plate system. The critical region of the bone is the holes where the screw inserted. In conclusion, the preload values of the screw should not exceed the 500 N for the successful fixation.

本研究的目的是检查螺钉预紧力值对骨板系统的影响。在 50 N 到 3000 N 的文献范围内采用不同的预紧力值。在本研究中检查了这些预紧力值。使用有限元方法计算模型的应变和应力。使用 CAD 软件将长骨、钢板和螺钉建模为 3D。有限元模型是使用 Ansys Workbench 软件创建的。对正确结果进行了收敛和验证研究。400 N 轴向载荷施加到骨的近端。骨骼的远端固定为边界条件。预载荷值以不同的方式应用于螺钉。对有限元分析的结果进行了比较和评估。结果表明，当预紧力值增加时，von Mises 应力和骨骼和板系统上的应变增加。螺钉的临界预紧力值为 500 N。此临界值的上限可能会损坏骨骼和骨板系统。骨骼的关键区域是螺钉插入的孔。总之，螺钉的预紧力值不应超过 500 N 才能成功固定。