The Construction of Three-Dimensional Finite Element Model of TKA Knee

The goal of this study is to construct a three-dimensional (3D) finite element model (FEM) of total knee arthroplasty (TKA) knee including bones, collateral ligaments and total knee prosthesis. Computed tomography (CT) and magnetic resonance imaging (MRI) image data of normal knee joint are imported into MIMICS software. The 3D models of bones and collateral ligaments are respectively reconstructed from CT and MRI image data. Then the reconstructed models are registered and fused together based on external landmarks. The virtual osteotomy and total knee prosthesis implantation are performed to establish the 3D model of TKA knee. Ultimately, A elaborate 3D FEM of TKA knee including anatomical structures and total knee prosthesis is obtained by meshing the 3D model of TKA knee and setting material properties, loading and boundary conditions. The obtained von Mises stress on the polyethlene insert confirms to the clincial mechanical distribution characteristics after TKA. The 3D FEM of TKA knee retains the integrity and accuracy in the anatomical features and provides a foundation for accurate research on the TKA knee biomechanical behaviors.