Biomechanical Modeling And Calculation Of Articular Cartilage

Virtual reality is a multidisciplinary and comprehensive technology.It has become a hot topic in current domestic and international cutting-edge fields.As a typical application in virtual reality,virtual operation system can decrease the risk of operation failure through opening operation training for doctors and the plan for rare disease operation scheme.Therefore,this study will greatly promote the development of digital medical field in China.However,in the virtual operation system,the basic operation is the deformation simulation of all kinds of human tissue.Therefore,biomechanical modeling of human tissue is not only a difficulty,but also one of the most key link in the virtual operation system because of the complex mechanical behavior of real human tissue.In this paper,based on the material properties and mechanical properties of articular cartilage,we will accomplish the research of the establishment of cartilage biomechanical model and calculation method.Biphasic porous medium model,based on continuum medium mechanics and mixture theory,can be used to describe the mechanical behavior of articular cartilage.A description is used to represent the articular cartilage as a two-phase mixture of incompressible inviscid fluid and a hyperelastic,transversely isotropic solid,and the articular cartilage can also change cartilage tissue permeability under large deformation.The stress-strain relations for the solid phase are defined in terms of the Helmholtz free energy function.The establishment of the governing equations is based on the constitutive relation of cartilage and the porous medium model.The v-p finite element system balance equation for quasi-static problem is obtained by the application of Galerkin weighted residual method,which is solved numerically via finite difference methods,At last,we implement the finite element analysis of the model in the C language environment of Visual Studio platform.Through compiling the infinit element programme of articular cartilage mechanical model and making numerical simulation to mechanical behavior of cartilage,we got the stress-strain curve.Then through the comparision and analysing related experiments data,we made the accuracy of the model and computing result verified.The paper implemented the study on individual and precise method of cartilage biomechanics modeling and laid the foundation further for the simulation of other biological tissue deformation.