新型解剖锁定钢板治疗肱骨远端骨折的有限元分析

Finite Element Analysis on the Novel Anatomical Locking Plate for Distal Humerus Fractures

目的:通过有限元模型分析新型解剖锁定钢板固定肱骨远端骨折模型的稳定性,验证该新型解剖锁定钢板的固定效果,为钢板生产及临床应用提供理论依据。方法:将右肘关节CT断层扫描数据以dicom格式导入mimics19.0中,可以得到三个不同的视图(即原始的轴向视图和由切层数据得到的冠状面和矢状面)。将mimics导出的STL文件导入ANSA14.0中,将网格模型导出inp格式文件,导入Abaqus2016中进行计算,生成新型解剖锁定钢板网格模型。网格模型限制肱骨近端自由度,肱骨远端施加垂直向下50 N集中载荷,观察其应力及位移情况。结果:肱骨远端施加垂直向下载荷(50 N)条件下,新型解剖锁定钢板及螺钉最大应力为12.53 MPa,最大位移为6.62μm。结论:有限元分析结果表明,新型解剖锁定钢板固定肱骨远端骨折稳定性良好,可满足临床使用要求,达到固定条件。

Objective:To verify the fixation efficacy of the new anatomical locking steel plate,and to provide theoretical basis for steel plate production and clinical application,by finite element analysis of the stability of a new anatomical locking plate for fixation of distal humeral fractures in a model.Methods:CT scan dicom format data of the right elbow joint were imported into mimics19.0,and three different views were obtained,the original axial view and the coronal plane and sagittal plane obtained from the sectional data.The mimics exported STL file import into ANSA14.0,export the grid model into inp format,import it into Abaqus2016 for calculation,and generate the novel anatomical locking plate grid model.The grid model limited the degree of freedom of the proximal humerus,and the distal humerus was subjected to concentrated loads of 50 N vertically downward and observe its stress and displacement.Results:Under the vertical downward load(50 N)applied to the distal humerus,the maximum stress of the new anatomic locking plate and screw is 12.53 MPa and the maximum displacement is 6.62μm.Conclusion:The results of finite element analysis show that the new anatomic locking plate has good stability and can meet the requirements of clinical and the fixed conditions.