Three-Dimensional Finite Element Analysis of the Biomechanics of the Osteotomy Ends of the Hallux Valgus Osteotomy with Three Different Fixations
Objective:To compare three different fixation methods after hallux valgus minimally invasive osteotomy,namely bandage split-toe pad,Kirschner wire and Herbert screw fixation,the displacement and stress distribution of osteotomy end,and the maximum stress and distribution of internal fixation.Methods:A patient with mild or moderate hallux valgus was scanned with foot CT image,and a three-dimensional finite element model was established by CT images of his foot.The maximum displacement and stress distribution of osteotomy end in plantar flexion of foot were analyzed by simulating minimally invasive osteotomy with bandage,Kirschner wire and Herbert screw fixation.Results:Maximum equivalent stress of osteotomy end fixed with bandage,Kirschner wire,Herbert screw was 7.861 5,14.253 0,8.315 6 MPa,respec-tively.Total displacement of osteotomy end fixed by bandage,Kirschner wire,Herbert screw was 0.268 960,0.022 779,0.029 195 mm,respectively.Maximum stress of Kirschner wire and Herbert screw near osteotomy end was 154.700 and 46.404 MPa,respectively.Conclusion:Fixation strength and stability of Kirschner wire and Herbert screw were better than bandage.Kirschner wire had stress concentration phenomenon,with potential fracture risk.Stress of Herbert screw was evenly distributed around osteotomy end,and there was a certain stress concentration,playing an important role in maintaining fracture end stability.
万方数据
维普
