Finite Element Analysis of Different Internal Fixation Methods for Herscovici Type B and C Medial Malleolus Fractures
Objective To explore the biomechanical stability of different internal fixation methods and different implantation angles for Herscovici B and C medial malleolus fractures by finite element analysis.Methods The three-dimensional models of distal tibia were established by Mimics 19.0 software,and the models were processed and assembled with internal fixators by using Geomagic Studio 2013 and SolidWorks 2017 software to establish Herscovici B-type and C-type ankle fractures,as well as three different internal fixation models,including fully threaded screws,semi threaded screws,and Kirschner wire tension bands.The ANSYS Workbench 17.0 finite element analysis software was used to set parameters and apply loads to the models,and the stress,displacement of fracture ends,stress and displacement of internal fixators were analyzed.SPSS 26.0 software was used for statistical analysis.Results For Herscovici B fracture,under the same load,the three internal fixation methods were most stable at the angle of internal fixation insertion ranging from 130° to 140° with respect to the fracture line(P＜0.05);Under the same conditions of load and internal fixator insertion angle,the fully threaded screw group was more stable than the other two internal fixation methods.For Herscovici C fracture,under the same load,the three internal fixation methods were most stable at the angle of internal fixation insertion ranging from 130° to 140° with respect to the fracture line(P＜0.05);Under the same conditions of load and internal fixator insertion angle,the fully threaded screw group was more stable than the other two internal fixation methods.Conclusion For Herscovici B and C fractures,the stability of fully threaded screw is better than that of half threaded screw and Kirschner wire tension band,and the effect of stability is better when the insertion angle is within the range of 130°-140° with respect to the fracture line.This has reference value for the clinical treatment of Herscovici B and C medial malleolus fractures.
Medial malleolus fractureFinite element analysisAngleFully threaded screwHalf threaded screwKirschner wire tension band
万方数据
维普
