The Mechanical Analysis Of Artificial Hip Prosthesis' Personalizde Transplantation

The hip joint is a key joint for human body, which bears the weight of the upperbody. However, due to issues such as sprain and femoral head, the hip joint is prone tobe failing and needs replacing as an effective method to cure it. Worldwide around ahalf million patients of the hip joint damage have to replace hip joint prostheses.In ourcountry also has a large number of patients require hip replacement.The efficiency of hip joint prostheses is intimately related to its mechanicalenvironment with its stress dependent on dimensions and installation locations. For themoment, hip joint prostheses in clinical practice is only limited to several pre-definedspecifications, thus making impossible the customized implant for the individual patient.Aimed at this problem, this paper conducts an investigation.First we have built the mechanical model for the man standing on one foot andbased on this, finite element model is also constructed. After force analysis, we haveobtained the maximum stress. In order to study different mechanical properties of hipjoint prostheses made by four currently available materials, each implant model withcorresponding material is built, in which the smallest contact stress4.31Mpa occurswhen UHMWPE polymer is matched with Ti6A14femoral head. Change of thematerial of the femoral head had a little effects on the change of the contact stress, theprosthetic material has little effect to the deformation of the prosthesis,so in the laterdesign of hip joint, we should consider the material properties of the acetabulum.Based on finite element analysis, the optimization processor will refine thestructural sizes of the implant. In conclusion, for the range of three installation locations,we have obtained the implant sizes with smallest resultant stresses after optimization,which are respectively11mm for thickness of acetabular bone,32mm for the diameterof femoral head and39mm for the length of femoral neck. In the most optimal design,Maximum stress decrease from4.31Mpa to3.11Mpa, reduced twenty-seven percent,and the optimization effect is obvious.