Finite Element Analysis And Experimental Verification Of Titanium Plate Fixation For Femoral Fracture System

Plates are the most commonly used fixation devices on treatment of femoral fracture,Hwoever, due to the unique mechanical properties and the strong bearing capacity of thefemur, the case of plate broken at the head of the body skeleton. To study the causes of platebroken, the most convenient way is to start from the biomechanical point of view. Researcheson the mechanical properties of the femur, perdecessors have done a lot of work. But most ofthe projects were limited to the study of single femur, which has been unable to meet theneeds clinical treatment and plate design. With the femur’s healing, the stress on the femurand plate is in the process of dynamic transfer. Therefor, healing factors of femur can beconsidered to more fully describe the stress conditions, on study of femoral fracture fixation.This paper study on titanium plate fixation of femoral fracture, analyzed the stress of thefemur and plate in different healing period of the femur, and experiments had been carried outto verify the finite element analysis program. The main research content is as follows:1. This paper described the research status of bone biomechanics in China and abroad,raised the shortage of the femur fracture system research at this stage, and introduced the fem-oral anatomic structure, femoral fracture type and mechanism of femoral healing, which prov-ide a theoretical basis for the subsequent finite element analysis and experimental design.2. The three-dimensional model of the femur was rebuilt on Mimics software, Geom-agic software and CT scan images. Plates and bone screws were drawn in Pro/E. Afterassembly, femur fracture system model was set up.3. ANSYS software was used for finite element analysis on femoral fracture system, toget the stress-strain conditions of the femoral fracture system, in healing condition of0%、25%、50%、75%, under different loads including axial compression, inside and outsidebending, before and after bending, and the compound loading of torsional and axial compress-ion and inside and outside bending. At last, the data of the results were analyzed.4. This paper used the electrical measuring method to do the mechanics test of femoralfracture system. Research designed two group of experiments, one was corpse dry bone group,the other was fresh pig bone group, and selected polyurethane, rubber and pine three materialto fill the broken femur place, to simulate the callus of different healing condition of femur.Strains of eight positions on femur fracture system were measured under the axial load. Fourof them were on plate and the other four were on femur. Finally, the finite element analysiswas done on actual model and loading conditions in experiment.5. Through the comparation of the experimental data and the finite element analysis data,we can know if the stress and strain conditions of experiment and finie element analysis werethe same, in different healing period of femur, so as to verify the accuracy and feasibility ofthe finite element analysis program used in the study.