Numerical Simulation Research On The Treatment Of Pelvic Ring Fractures By Reconstruction Of The Configuration Of Locking Plate

With the improvement of life level, increasing frequently traffic accidents，theincidence of pelvic fractures are rise year by year. The improvement of medicaltechnology makes the treatment of pelvic fractures have a deep understanding. Thetype of pelvic fractures and a variety of treatment. This article is through the pelvisaxial pressure experiment results and pelvic3D biomechanical model of finiteelement calculation results to discuss. Experiment the pelvis is to choose a34year oldwithout healthy male pelvis, axial pressure experiments on surface of the sacrum,pelvis. Under the condition of the loading force of500N, the axial stress tests10times. Pelvic axial pressure experimental results consistent with the results in relatedliterature shows. Through the pelvis3D biomechanical model of finite elementcalculation results were compared with the experimental results, check on thereliability of the pelvis3d biomechanical model based on3d biomechanical model ofpelvis, three-dimensional biomechanical model for pelvic fractures. Discussed underthe condition of different fixed way, which kind of pelvic fractures3D biomechanicalmodel of the mechanical properties of the best, for the surgical treatment of pelvicring fracture before has a certain reference value.Fracture fixation system model is established in this paper, using CATIA, by CTscan, using of medicine engineering software Mimics, the pelvis model is set up,and establish the pelvic fractures in the Mimics model, to differentiate good surfacegrid, finally into ABAQUS finite element analysis. Model has established7groups,respectively, A, B, C, A1, B1, C1and group D. Among them, the group Dthree-dimensional finite element model for pelvis. Other6groups ofthree-dimensional biomechanical model for pelvic fractures. A, B, C groups of locking plate fixation system is Φ3x20mm screw and steel plate. A1, B1, C1groupsof locking plate fixation system for Φ3x25mm screw and steel plate. Screw nailsinto the way of screw parallel respectively nailing, on both sides of screw and screwinto20degrees among nailing on both sides and screw with the middle screw45Angle nail.Through the experiment results indicate that the pelvis load of500N force whenthe maximal displacement on surface of the sacrum is0.896mm which is consistentwith the results of the literature. Through finite element analysis results indicate thatthe maximum displacement finite element calculation model of group A is0.813mm,B group of finite element calculation model of maximum displacement is0.738mm,group C model of finite element computing the maximal displacement of0.714mm,A1group of finite element calculation model of maximum displacement is0.723mm,B1group of finite element calculation model of maximum displacement is0.699mm,C1group of finite element calculation model of maximum displacement is0.685mm.No fracture of pelvis3d biomechanical model in force under the load of the maximaldisplacement consistent with the experimental results, the pelvis3d biomechanicalmodel is reliable. Finally,6groups of pelvic fracture3D biomechanical modelcomparing with the results of finite element analysis.Conclusion C1group model, that is, on both sides of the locking plate fixationsystem is screw (Φ3x25mm) and the middle nail screw as a way for45degrees intothe fracture, pelvic fractures3D biomechanical model best mechanical properties,stability is the best. For the treatment of pelvic ring fractures surgery has a certainreference value.