| The research shows that the traditional cemented knee tibial plateau prosthesis is easy to cause complications such as loosening of prosthesis and deep vein thrombosis of lower limbs.With the rapid development of metal 3D printing technology,metal trabecular bone began to be used in the design of tibial plateau prosthesis.Clinical research shows that the shape of trabecular bone structure can have an important influence on bone growth after prosthesis implantation,and even trabecular bone can not meet the needs of bone growth after prosthesis implantation.Therefore,it is of great significance to screen out the trabecular cell structure with excellent geometric parameters and mechanical properties,make reasonable assembly and design the partitioned trabecular tibial plateau prosthesis for improving the survival rate of the prosthesis and reducing revision.The influence of trabecular metal structure on bone ingrowth has always been the focus of orthopedic implant research.Using numerical simulation to explore the tibial plateau prosthesis with better effect of bone ingrowth,and exploring the influence of trabecular metal structure on part of tibial cancellous bone ingrowth through bone reconstruction simulation has important guiding significance for the design of tibial plateau prosthesis and postoperative rehabilitation of patients.In this paper,the trabecular cell structure and partitioned trabecular tibial plateau prosthesis are taken as the main research objects,and the trabecular cell structure and porous scaffold are designed.A simplified model of partitioned trabecular tibial plateau prosthesis is established by screening and assembling,the reconstruction and evolution process of bone tissue after the prosthesis is implanted is studied,the effect of bone ingrowth is simulated,titanium alloy partitioned trabecular tibial plateau prosthesis is prepared by 3D printing technology,and fatigue experiments are carried out according to the standard.The main research contents are as follows:(1)Summarize the research background and present situation of trabecular bone structure,knee tibial plateau prosthesis and bone reconstruction at home and abroad,introduce the development trend of trabecular bone structure and tibial plateau prosthesis,and expound the main research purpose and significance of this topic.(2)The design of trabecular cell structure and trabecular porous structure.Eight types of trabecular bone cell structures and six types of trabecular bone porous scaffolds were established,and their geometric structure parameters and mechanical properties were compared and analyzed,and the Cell6 trabecular bone cell structure with the best comprehensive performance was selected.Through analysis,it is found that porosity and pore size have great influence on the cellular structure of trabecular bone and the mechanical properties of trabecular porous scaffold.(3)The establishment and finite element analysis of simplified model of partitioned trabecular structure and partitioned trabecular tibial plateau prosthesis.According to the characteristics of bone density of knee joint prosthesis with trabecular bone structure and proximal tibia cancellous bone of human body,three groups of simplified models of platform prosthesis of trabecular bone tibial prosthesis were established with four different sizes of Cell6 trabecular bone cell structure.The strain distribution rule of the model was obtained by finite element analysis,and the calculation results were analyzed by mathematical software MATALB.It was found that the assembling mode of partitioned trabecula had obvious influence on bone ingrowth,and finally the tibial plateau prosthesis of partitioned trabecula with the best bone ingrowth(2.25mm-2.0mm-2.5mm assembling)was selected.(4)The simulation of bone reconstruction of the simplified model of tibial plateau prosthesis under different loads.Using the function of modifying material parameters and element stiffness in finite element analysis software ANSYS and APDL parametric design language,this paper studies the reconstruction and evolution of bone tissue and redistribution of structural internal forces after the implantation of partitioned trabecular tibial plateau,and carries out numerical simulation of bone reconstruction under different loads for a simplified model of partitioned trabecular tibial plateau prosthesis,which provides some theoretical guidance for patients’recovery according to the results.(5)The fatigue test of the tibial plateau prosthesis with subarea trabecula.Fatigue experiments were carried out on 3D printed titanium alloy subarea trabecular tibial plateau prosthesis and zirconium niobium alloy subarea trabecular tibial plateau,and the fatigue performance of the two tibial plateaus under 900N and 1200N cyclic loads and 10~7 cycles was tested.According to the experimental results,the fatigue performance of the two tibial plateaus was compared,and some suggestions for the use of the two tibial plateaus were put forward.(6)Compression experiments of different types of tibial plateau prostheses.Four different types of tibial plateaus were compressed,and their yield load and bending deformation resistance were measured.The tibial plateau prosthesis model was numerically simulated and analyzed.By comparing the analysis results with the experimental results,the accuracy of the experimental results was verified. |
PDF Full Text Request