骨折髋支撑关节治疗股骨颈骨折的有限元力学分析(英文)

Finite element mechanical analysis on fracture hip supporting joint for treatment of femoral neck fracture

背景：股骨颈骨折除关节置换以外,其他治疗方法均存在股骨颈骨折愈合缓慢,预后差,并发症多,长时间不能负重的问题。课题组研制的骨折髋支撑关节是一种新型、非限制型髋关节支撑器,集骨折固定与关节支撑于一体,攻关年轻人股骨颈骨折并发症防治难题。目的：分析骨折髋支撑关节治疗股骨颈骨折的力学效应。方法：采用AutoCAD导入方式建立3组2D有限元模型,即正常髋关节、股骨颈骨折2钉固定、2钉固定＋骨折髋支撑关节模型。选用ANSYS（PLANE82）划分网格二维4节点单元,等同条件下分别完成计算。结果与结论：正常髋关节组、股骨颈骨折2钉固定组的股骨头承重区应力峰值为1.029,1.63MPa,2钉固定＋骨折髋支撑关节组仅为0.1－0.4MPa。股骨颈骨折2钉固定组的骨折固定螺丝钉应力峰值为37.186MPa,2钉固定＋骨折髋支撑关节组仅为7.474MPa。结果提示,在多钉固定基础上安装骨折髋支撑关节,可保护股骨颈和股骨头修复愈合,为年轻人股骨颈骨折治疗展现了良好的前景。

BACKGROUND：For treatment of femoral neck fracture,all therapies with the exception of joint replacement encounter the problems including slow healing,poor prognosis,various complications,and unable to bear weight for long time.Fracture hip supporting joint（FHSJ）is a novel unlimited hip support implement that possesses the double functions of fracture fixation and joint supporting and can be used to prevent and treat the complications of femoral neck fracture in young people. OBJECTIVE：To investigate the mechanical effects of FHSJ on treatment of femoral neck fracture. METHODS：Three types of two-dimensional finite element models were constructed by AutoCAD：normal hip（group A）,femoral neck fracture fixed with two screws（group B）,and femoral neck fracture fixed with two screws and FHSJ（group C）.The grids of two-dimensional four nodal point elements were divided by ANSYS（PLANE82）.Under the identical condition,the calculations were performed respectively. RESULTS AND CONCLUSION：The stress peak value of femoral head weight-bearing zone was 1.029 and 1.63 MPa in group A and group B,respectively,and that in the group C was 0.1-0.4 MPa.The stress peak value of the screws was 37.186 and 7.474 MPa in the group B and group C,respectively.These results indicate that FHSJ installation based on fixation of multiple screws could promote the recovery of femoral head and neck,which exhibits promising prospects in treatment of femoral neck fracture in young people.