Proximal humerus fracture is a common injury and is usually treated using an internal fixation. However, clinical studies have reported that such treatments are associated with problems such as varus deformity and screw penetration. Therefore, to solve these problems, a surgical method using fibular allografts (FAs) is recently reported. Thus, this study is aimed to confirm the effective insertion angle ([Formula: see text], [Formula: see text], [Formula: see text], and [Formula: see text]) of the FA. We applied axial and shear loads to finite element models used in our study. Finite element simulations using these models were repeated five times for each fibular insertion angle. We evaluated the construct stiffness, stress distribution on the plate and fibula, and fracture micromotion. Results showed that the method using the FA caused less stress on the plate and provided higher structural stability than the method without using the FA. In particular, the axis perpendicular condition yielded significantly greater construct stiffness and caused less von Mises stresses than the other conditions. In conclusion, the finite element analysis results showed that the FA inserted horizontally was effective in the treatment of proximal humerus fracture with an unstable medial support.

中文翻译：

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使用有限元分析估计肱骨近端骨折的最佳腓骨移植角

肱骨近端骨折是一种常见的损伤，通常使用内固定治疗。然而，临床研究报告称，此类治疗与内翻畸形和螺钉穿透等问题有关。因此，为了解决这些问题，最近报道了一种使用腓骨同种异体移植物（FAs）的手术方法。因此，本研究旨在确认 FA 的有效插入角度（[公式：见文]、[公式：见文]、[公式：见文]和 [公式：见文]）。我们将轴向载荷和剪切载荷应用于我们研究中使用的有限元模型。使用这些模型的有限元模拟对每个腓骨插入角度重复五次。我们评估了构造刚度、钢板和腓骨上的应力分布以及骨折微动。结果表明，与不使用FA的方法相比，使用FA的方法对板产生的应力较小，结构稳定性更高。特别是，与其他条件相比，轴垂直条件产生了显着更大的结构刚度并产生了更少的 von Mises 应力。综上所述，有限元分析结果表明，水平置入的FA治疗内侧支撑不稳定的肱骨近端骨折是有效的。