目的:采用三维有限元法比较交锁髓内钉和加压锁定钢板固定股骨远端骨肿瘤切除重建术后抗扭转生物力学特性,为临床选择有效的内固定方法提供理论依据.方法:选取临床上骨肿瘤术后病人,采用锁定钢板和交锁髓内钉内固定方法,建立骨肿瘤三维有限元模型,导入ABAQUS进行有限元分析,在(0-30)N·m作用下,锁定钢板和交锁髓内钉的应变和应力分布情况.结果:两组模型应力均未达到屈服应力,两种模型在(0-30)N·m扭矩作用下呈线性分布,锁定钢板的抗扭转特性大于髓内钉的,锁定钢板的应力分布比较均匀,最大主应力为0.2689Mpa,最大应变是2.378×10-7.髓内钉的最大应力为0.3669Mpa,最大应变是3.324×10-6.结论:在临床上锁定钢板和交锁髓内钉都能成功治疗骨肿瘤,交锁髓内钉的抗扭转性能弱于锁定钢板,但能满足临床内固定的需要,具有较大临床应用价值.%Objective: To analyze the rotation of biomechanical features the two internal fixations for distal femoral tumor by using finite element analysis method (FEM), and t to provide theoretical support for its clinical application. Methods: 3-D finite element models of the locking compression plates and Interlocking intramedullary nails that are commonly-used in clinical practice were generated. T, A 3-D model of femur was also created. Then finite element analysis was performed in Abaqus. The stress and strains of models were predicted under torsion loads (0-30 ) Nm. Results: Stresses of all models do not exceed yield strength. The locking compression plates and Interlocking intramedullary nails kept elasticity when given ( 0-30 ) N-m torsional moment at the distal portion of the femurjocking compression plates stress well-distributed.the maximum principal stress is 0.2689Mpa. The maximum strains is 2.378 x 10 , Interlocking intramedullary nails maximum principal stress is ().3669Mpa. The maximum strains is 3.324 x 10 .respectively. Conclusions: Locking compression plates and Interlocking intramedullary nails commonly-used successly in clinical practice. The anti-torsion properties of the Interlocking intramedullary nails is inferior to that of the locking compression plates, which gives great clinical values.
展开▼
