Structure Design And Simulation Of Magnesium Alloy Tibia Bone Plate

Internal fixation of bone plate is a method for the treatment of fractures, which is widely used in clinic at present. During the development of more than one hundred years, the material and structural design of plate and the treatment concept has been greatly developed. The materials of bone plate are often titanium alloy, stainless steel, etc. Since the elastic modulus of these materials is larger, this can easily result in symptom of osteoporosis. However, magnesium alloy can avoid this case for its little elastic modulus. In addition, the tibia is a key part of carrying the body load and completing the body movement, so tibia bone plate fracture often happens after operation. Therefore, the study of magnesium alloy tibia bone plate for clinical practice has a very important practical significance.The paper takes that magnesium alloy bone plate fixes transverse fracture of tibia in middle part for research background. This paper established four different bone plate internal fixation systems for tibial fracture by SolidWorks software and ANSYS Workbench software is used for static analysis to these internal fixation systems under five different load conditions. Through the finite element analysis of the magnesium alloy bone plate, the paper studied the intensity and the rigidity of the different plate and the influence of different loading on the plate. In addition, the finite element analysis model is verified by mechanical test and theoretical calculation.By combining the three methods of the finite element analysis, the theoretical calculation and mechanical property test, we can get that the strength of four types of magnesium alloy bone plates can meet the performance requirements of magnesium alloy materials under five kinds of loads and especially the highest intensity is dentiform bone plate. Moreover, the design of surface texture obviously improves the stress distribution and can effectively improve the strength of the plate. Through the finite element analysis of bending stiffness and torsional stiffness of different types of magnesium alloy bone plate, the research shows that four types of magnesium alloy bone plate can meet the bending stiffness and torsional stiffness requirements. While the surface texture has little effect on the bending stiffness of the magnesium alloy bone plate, it greatly increases the torsional stiffness of the bone plate. By experimental analysis of the mechanical properties of the magnesium alloy bone plate, it gets the maximum bending load and maximum pressure load of the bone plate, which verified the rationality of finite element analysis and theoretical calculation. The results show that magnesium alloy tibia bone plate not only can meet the needs of rigidity but also can effectively reduce stress shielding effect. Therefore, magnesium alloy as a new internal fixation material has great advantages and feasibility.