不同进针角度张力带对髌骨C1型骨折治疗的有限元分析

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Abstract Objective To establish a three-dimensional finite element model for internal fixation of patellar C1 fracture with titanium cable tension band，and to analyze the finite element mechanics of the model.Methods One adult male volunteer was scanned by thin slice CT of lower extremity.The patella geometric model was established by image data through software.The patella C1 fracture was simulated by the segmentation function of software.Two tension band pins and “8” shaped titanium cable were generated by the scanning function of software.A three-dimensional tension band fixation model of C₁ fracture was established to simulate the 90 degree patellofemoral joint of flexion knee.Finite element analysis was carried out to analyze the displacement and deformation characteristics of the force 600N.Results a)Displacement of fracture patella：Parallel insertion of tension band pin was smaller than that of angular insertion of tension band pin；b)Pressure of fracture surface：When tension band was parallel，the peak pressure of fracture surface was larger than that of angular insertion；c)Relative sliding distance of fracture surface：When tension band pin was parallel，it is smaller than that of angular insertion.Conclusion Parallel tension band pin placement is better than angular pin placement.The results are consistent with biomechanical results.Finite element analysis is helpful to understand the advantages and disadvantages of different angle tension band internal fixation for patellar fracture，and to provide a theoretical basis for further understanding the therapeutic effect of patellar fracture.

Key words： patellar fracture tension band finite element model biomechanics

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