股骨夹具修复股骨粗隆间骨折的有限元分析

Finite Element Analysis of Femoral Prosthesis for the Repair of Intertrochanteric Fracture of the Femur

摘要: 针对股骨粗隆间骨折的修复问题，本文以最常见的股骨近端防旋髓内钉(PFNA)装置作为测试装置。本文采用有限元分析的方法，对比分析了髓内钉主钉与螺旋刀片的不同夹角(68˚、64˚和72˚)静止站立状态下股骨、内固定装置变形及应力的分布特征，并与同等条件下正常股骨的力学特征进行了比较。结果表明，68˚ PFNA组的股骨最大变形与正常股骨最为相似，最大等效应力集中在骨钉处，相较于64˚和72˚ PFNA组更有利于骨折修复，故佐证68˚为股骨夹具修复的最佳角度。

Abstract: Focusing on the repair of intertrochanteric fractures, this study uses the most common Proximal Femoral Nail Antirotation (PFNA) device as the test apparatus. Employing the finite element analysis method, the study compares and analyzes the distribution characteristics of deformation and stress in the femur and internal fixation device under static standing conditions for different angles (68˚, 64˚, and 72˚) between the main nail and the spiral blade. These findings are then compared with the mechanical characteristics of a normal femur under the same conditions. The results indicate that the maximum deformation of the femur in the 68˚ PFNA group most closely resembles that of a normal femur, with the maximum equivalent stress concentrated at the bone nail. Compared to the 64˚ and 72˚ PFNA groups, the 68˚ configuration is more conducive to fracture healing, thereby validating 68˚ as the optimal angle for femoral prosthesis repair.