花瓣状多轴锁定板固定髌骨Y形骨折的有限元分析  

A finite element analysis of petal-shaped poly-axial locking plate fixation in treatment of Y-shaped patellar fracture

作　　者：蒙德鹏[1] 欧阳跃平[1] 侯春林[1] 

机构地区：[1]第二军医大学长征医院骨科,上海200003

出　　处：《中国修复重建外科杂志》2017年第12期1456-1461,共6页Chinese Journal of Reparative and Reconstructive Surgery

摘　　要：目的建立钛合金花瓣状多轴锁定板固定治疗髌骨Y形骨折的三维有限元模型,并进行力学分析。方法使用Mimics 19.0、Rhino 5.0、3-Matic 11.0和ANSYS Workbench 16.0软件建立花瓣状多轴锁定板固定治疗髌骨Y形骨折的三维有限元模型。采用上下极约束,对髌骨下、中、上1/3关节面分别施加2.0、3.5、4.4 MPa压应力的方法,模拟屈膝20、45及90°时髌骨受到的应力,计算等效应力及位移值。结果模型节点个数和网格个数分别为456 839和245 449。模型最大等效应力为151.48 MPa,出现在屈膝90°状态,小于钛合金和髌骨的屈服强度;骨折块的最大位移值为0.092 8 mm,出现在屈膝45°状态,符合临床要求。最大等效应力和最大移位值分布在水平骨折线周围及螺钉较稀疏的部位。结论钛合金花瓣状多轴锁定板固定髌骨Y形骨折力学性能良好,固定可靠,但实际效果有待进一步验证。Objective To establish the finite element model of Y-shaped patellar fracture fixed with tita- nium-alloy petal-shaped poly-axial locking plate and to implement the finite element mechanical analysis. Methods The three-dimensional model was created by software Mimics 19.0, Rhino 5.0, and 3-Matic 11.0. The finite element analysis was implemented by ANSYS Workbench 16.0 to calculate the Von-Mises stress and displacement. Before calculated, the upper and lower poles of the patella were constrained. The 2.0, 3.5, and 4.4 MPa compressive stresses were applied to the 1/3 patellofemoral joint surface of the lower, middle, and upper part of the patella respectively, and to simulated the force upon patella when knee flexion of 20, 45, and 90°. Results The number of nodes and elements of the finite element model obtained was 456 839 and 245 449, respectively. The max value of Von-Mises stress of all the three conditions simulated was 151.48 MPa under condition simulating the knee flexion of 90°, which was lower than the yield strength value of the titanium-alloy and patella. The max total displacement value was 0.092 8 mm under condition simulating knee flexion of 45°, which was acceptable according to clinical criterion. The stress concentrated around the non-vertical fracture line and near the area where the screws were sparse. Conclusion The titanium-alloy petal-shaped poly-axial locking plate have enough biomechanical stiffness to fix the Y-shaped patellar fracture, but the result need to be proved in future.

关 键 词：髌骨骨折 多轴锁定板 有限元分析 生物力学 

分 类 号：R687.4[医药卫生—骨科学]