Numerical Simulation And Experimental Study Of Artificial Hip Joint Replacement With Bone Trabecular Structure

At present,with the progress of science and technology and the maturity of hip replacement technology,artificial hip replacement surgery has been accepted by more and more people.For patients with loss of basic hip function and ineffective drug treatment,the most effective treatment is artificial hip replacement surgery.But artificial hip replacement surgery is to replace the damaged hip joint with artificial hip joint prosthesis,which will naturally change the mechanical distribution of femur.At the same time,the use of bone cement to fix the stem and cup of bone will affect the growth of bone cells because of the high temperature in the process of cement solidification,which will lead to subsequent problems such as bone resorption,bone atrophy,and complications caused by the problems of prosthesis.Therefore,in order to solve these problems,in the field of biomechanics,it is of far-reaching significance to study the performance of biological hip prosthesis with bone trabecular structure for improving the quality of surgery and reducing the pain of patients.The choice of prosthesis is very important in hip arthroplasty.In recent years,a new type of prosthesis with bone trabecular structure has emerged in the research of artificial hip prosthesis.The biggest difference between the prosthesis and other types of prosthesis is that a layer of titanium alloy trabecular structure is printed by metal 3D printing technology in the cup and handle of the prosthesis.The trabecular bone is a porous scaffold structure similar to cancellous bone structure.The clinical results show that the hip prosthesis with titanium alloy bone trabecular structure replacement has the advantages of fast bone growth and good therapeutic effect,and is superior to the cement hip prosthesis.However,there are relatively few biomechanical studies on hip replacement with trabecular hip prosthesis.In this paper,a three-dimensional solid model of hip replacement prosthesis with trabecular bone structure is established.According to the calculation results,the bone handle and cup with trabecular bone structure are designed and manufactured.The effect of bone trabecula on stress and strain of hip replacement was studied,which could provide reference for the design and clinical application of this new prosthesis.The research contents are as follows:(1)The related concepts of hip joint and the research status of hip replacement at home and abroad are summarized,and the purpose and significance of this paper are put forward.(2)A three-dimensional model of the hip joint with or without trabecular bone structure was established,and the numerical simulation was carried out based on ANSYS Workbench.(3)The artificial femur and pelvis were prepared.The experimental models of prosthetic stem with or without trabecular structure were made,strain gauges were pasted,and physiological loads were applied on the universal tension and pressure testing machine to carry out pressure experiments.The strain results of the measured points were obtained,and the numerical simulation and electricity were used.Compared with the experimental results,the accuracy of the three-dimensional model was verified and the results of the stress distribution difference between the trabecular structure and the non-trabecular structure were obtained.The results of numerical simulation of hip prosthesis with bone trabecular structure are analyzed,and the stress distribution results of each part of hip joint model with acetabular cup and cuff trabecular structure are obtained.The results are compared with those of numerical simulation of hip prosthesis before replacement,and the stress changes of each part after replacement are explained.By comparing three different groups of bone trabecular structure,the preliminary judgment is made.The cuff bone trabecular structure and the effect of the cup bone trabecular structure were broken.(4)The results of numerical simulation of hip prosthesis with bone trabecular structure are analyzed,and the stress distribution results of each part of hip joint model with acetabular cup and cuff trabecular structure are obtained.The results are compared with those of numerical simulation of hip prosthesis before replacement,and the stress changes of each part after replacement are explained.By comparing three different groups of bone trabecular structure,the preliminary judgment is made.The cuff bone trabecular structure and the effect of the cup bone trabecular structure were broken.(5)The three-dimensional models of hip joint with or without cup trabecular structure and sleeve trabecular structure were simulated respectively,and the effects of cup and sleeve trabecular structure on stress and strain of the main components after hip replacement were preliminarily studied.