利用克氏针治疗儿童股骨远端骨骺损伤的有限元分析

目的 研究不同构型克氏针治疗儿童SH-2型骨骺损伤的稳定性差异以及对骺板的损伤情况。方法 利用1名8岁患儿健侧股骨CT数据,将图像数据导入Mimics 21.0中建立粗略股骨、骨骺模型,后导入Geomagic 2013中构建得到曲面化模型。将上述模型在SolidWorks 2018中与3种克氏针构型（分散克氏针、双交叉克氏针、单交叉克氏针）完成装配后导入ANSYS Workbench 2019中,通过对装配体的不同力学加载模拟现实中的多种运动模式,分析骨折块的最大位移以及克氏针、骺板、骨折块von Mises应力分布及最大应力。结果 分散克氏针、双交叉克氏针、单交叉克氏针组的最大位移分别发生外展（2.39 mm）、内收（2.12 mm）、外展（2.21 mm）运动时,骺板最大应力分别发生在外展（1.22 MPa）、前屈（0.20 MPa）、后伸（0.29 MPa）运动时。结论 双交叉克氏构型针的稳定性优于分散布针及单交叉克氏针,并且对骨骺损伤最小。

Finite Element Analysis of Kirschner Wire Treatment for SH-2 Distal Femoral Fracture in Children

Objective To compare the stability of different Kirschner wire configurations for treating SH-2 type epiphyseal injury and damage to the epiphyseal plate in children. Methods The CT scanning data of a healthy femur from an eight-year-old child were collected; the image data were imported into Mimics 21.0 to establish a rough femoral and epiphyseal model, which was then imported into Geomagic 2013 to construct a surface model. The surface model was assembled in SolidWorks 2018 with three configurations (dispersed, double-crossed, and single-crossed K-wires) and then imported into ANSYS Workbench 2019. Various motion modes in reality were simulated through different mechanical loadings on the assembly. The maximum displacement of the fracture fragment, von Mises stress distribution, and maximum stress on the K-wire, epiphyseal plate, and fracture fragment were analyzed. Results The maximum displacements of the dispersed, double-crossed, and single-crossed K-wire groups occurred during abduction (2.39 mm), adduction (2.12 mm), and abduction (2.21 mm), and the maximum stress on the epiphyseal plate occurred during abduction (1.22 MPa), anterior flexion (0.20 MPa), and posterior extension (0.29 MPa), respectively. Conclusions The stability of the double-crossed K-wire configuration was superior to that of the dispersed and single-crossed K-wire configurations, with minimal damage to the epiphysis.