抗剪切力镍钛记忆合金髌骨爪力学性能的有限元分析

Finite element analysis on mechanical properties of anti-shearing force Ni-Ti shape memory alloy patella claw

目的建立髌骨骨折内固定抗剪切力镍钛记忆合金髌骨爪的三维有限元模型,并对所建模型进行力学性能分析。方法运用Pro/E 5.0建立髌骨横型骨折髌骨爪的内固定结构模型,导入ABAQUS 10.1中进行有限元力学性能分析。分别对人体屈膝30°、60°、90°时不同髌骨关节作用力FQ下髌骨爪力学性能及变形情况进行分析。结果在相同边界条件下,当FQ分别为367.5和3 675 N时,不同屈膝角度下最大位移变形量的位置不同。与张力带固定分析相比,髌骨爪固定稳定性更佳,抗张力更强,且抗剪切力。结论髌骨爪的变形和位移符合临床所需的生物力学研究结果,其稳定性能够满足临床尽早进行功能锻炼的要求。

Objective To establish a 3D finite element model of an anti-shearing force Ni-Ti memory shape alloy patella claw for fixing patellar fracture,and analyze its mechanical performance. Methods The internal fixation model of transverse patellar fracture by patella claw was established by Pro / E 5. 0,and then imported it into ABAQUS 10. 1 for finite element analysis on its mechanical properties. The mechanical performance and deformation of the patella claw under two different patella-femoral joint forces FQat the knee flexion angle of 30°,60°,90° were analyzed,respectively. Results Under the same boundary condition,with the respective FQas 367. 5 N and 3 675 N,the maximum displacements of deformation were different at different flexion angles. As compared to fixation by tension band,using patella claw was preferable,with stronger resistance to tension and more stable anti-shearing force. Conclusions Deformation and displacement of the patella claw are in accordance with the biomechanical results needed in clinic,and its stability can satisfy clinical requirements for functional exercise as early as possible.