Pauwels III型股骨颈骨折新型钢板的有限元分析

Finite element analysis of a new plate for Pauwels type III femoral neck fractures.

作者信息

Wang Gang, Tang Yong, Wu Xuhua, Yang Huilin

机构信息

Department of Orthopaedics, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu, China.

Department of Orthopaedics, 72nd Group Army Hospital of the PLA, Huzhou, Zhejiang, China.

出版信息

J Int Med Res. 2020 Feb;48(2):300060520903669. doi: 10.1177/0300060520903669.

BACKGROUND

A new plate for the treatment of Pauwels type III femoral neck fractures was developed, and its biomechanical stability was analyzed by the finite element method.

METHOD

Using 3-matic and UG-NX software, we constructed models of Pauwels type III femoral neck fractures with angles of 50°, 60°, and 70°. Moreover, a new femoral neck plate (NFNP) fixation model and a Pauwels screw fixation model were developed. Under axial loads of 1400 N and 2100 N, von Mises stress (VMS) distribution on the screws, peak VMS, displacement between fracture fragments, and model principal strains in cancellous bone were recorded.

RESULT

The peak VMS of internal fixation in the two models was mostly located near the fracture line, and the screw closest to the femoral calcar experienced maximum stress. With a Pauwels angle of 50°, 60°, and 70°, the peak VMS values of the new plates were lower than in the Pauwels screw. The displacement of fracture fragments in the NFNP was smaller than in the Pauwels screw, and peak VMS values of cancellous bone in the NFNP were lower than in the Pauwels screw.

CONCLUSION

The newly developed plate provided excellent biomechanical stability for Pauwels type III femoral neck fractures.

背景

研发了一种用于治疗 Pauwels Ⅲ型股骨颈骨折的新型钢板，并采用有限元方法分析其生物力学稳定性。

方法

使用 3-matic 和 UG-NX 软件，构建了 Pauwels 角为 50°、60°和 70°的 Pauwels Ⅲ型股骨颈骨折模型。此外，还建立了新型股骨颈钢板（NFNP）固定模型和 Pauwels 螺钉固定模型。在 1400 N 和 2100 N 的轴向载荷下，记录螺钉上的 von Mises 应力（VMS）分布、VMS 峰值、骨折块间位移以及松质骨中的模型主应变。

结果

两种模型内固定的 VMS 峰值大多位于骨折线附近，最靠近股骨距的螺钉承受最大应力。当 Pauwels 角为 50°、60°和 70°时，新型钢板的 VMS 峰值低于 Pauwels 螺钉。NFNP 中骨折块的位移小于 Pauwels 螺钉，NFNP 中松质骨的 VMS 峰值低于 Pauwels 螺钉。