Optimization Design Of Femoral Prosthesis Stem

The human hip joint disease,accidents resulting in loss or impairment of the joint function,will bring great pain and inconvenience to people's life and work,and the total hip replacement surgery is a very effective way to solve this problem,in clinical treatment it is widely adopted and applied.In total hip replacement,and femoral prosthesis is contact parts,it is the joint force of the main stress components,joint force by transfer to the femoral prosthesis,plays a role in the implantation of fixed joints,is an important component of artificial hip joint.The study of the influence of the geometry of the prosthesis stem on the stress distribution of the femur and prosthesis handle is of great significance to the design of prosthesis with low stress shielding effect.In this paper,we study the stress distribution of the femoral stem with rectangular cross section,and explore the stress distribution of the femur with different structure.Concrete research contents are as follows:(1)Using Mimics,Geomagic Studio,UG software,a three-dimensional solid model of femur was established according to the CT scan data of a healthy femur.Using UG's advanced simulation finite element function,the stress distribution of healthy femur was simulated under two kinds of biomechanical environment.(2)On the basis of proximal femur geometry data Mimics software measurement,to determine the contour size parameters of stalk;using two UG development technology,combined with C/C++ programming language,the internal structure of a solid,cylindrical hole,rectangular cavity three handle structure parametric modeling;in UG,the simulation of total hip replacement operation,establish three handle after operation model.In order to achieve the purpose of reconstructing the handle model according to the actual situation,the size parameters of the handle can be modified quickly.(3)Firstly,advanced simulation using finite element analysis method and UG NX simulation,in the single foot standing,still 45% gait three handle two biomechanical environment after the model of stress distribution,and the results of the stress distribution of femur and health were analyzed,the internal structure is obtained rectangular cavity handle stress shielding effect of the minimum conclusion.Then,the optimal design of the parameters of the rectangular cavity handle is carried out,and the rectangular cavity handle structure with low stress shielding effect and reasonable stress distribution is obtained.Through the research,it provides the accurate biomechanical parameters,the conclusive basis and the rapid optimization method for the design of the prosthesis handle.