Chinese Journal of Tissue Engineering Research ›› 2021, Vol. 25 ›› Issue (30): 4781-4786.doi: 10.12307/2021.261

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Parameters of finite element model of the knee joint

Zhang Jichao1, Dong Wanpeng1, Dong Yuefu2, Zhang Zhen1, Li Jiayi1, Ren Meng1    

  1. 1School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China; 2Lianyungang Hospital, Xuzhou Medical University, Lianyungang 222061, Jiangsu Province, China
  • Received:2020-11-27 Revised:2020-12-04 Accepted:2021-01-30 Online:2021-10-28 Published:2021-07-29
  • Contact: Dong Wanpeng, MD, Associate professor, School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China
  • About author:Zhang Jichao, Master candidate, School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China
  • Supported by:
     the National Natural Science Foundation of China, No. 31670956 (to DYF)

Abstract: BACKGROUND: With the deepening of knee joint related research, there are still some controversies about the accuracy and applicability of parameter selection when establishing the knee joint finite element model, and it is urgent to study.  
OBJECTIVE: To synthesize the literature of knee joint finite element model, provide more reasonable parameter settings for model construction and analysis, and improve its applicability.
METHODS:  The four aspects of model assumptions, material assignment, meshing and load application of osseous and non-osseous tissues in nine sets of domestic knee finite element model documents in the past five years were compared, and foreign literature and foreign research were combined to verify its rationality.  
RESULTS AND CONCLUSION: (1) Model assumptions: Bones are set to rigid body; ligaments are set to be superelasticity; meniscus is set to be laterally isotropic; cartilage is set to be single-phase isotropic linear elasticity. (2) Material assignment: Bones do not need to be assigned; ligaments are assigned shear modulus; meniscus are assigned values in axial, radial and circumferential directions; cartilage is assigned elastic modulus. (3) Meshing: Shell elements for bones; 8-node hexahedral or second-order tetrahedral elements for non-bone tissues. (4) Load application: Axial load of twice the body weight is applied at the femoral reference point. (5) The parameter settings obtained by comparison can make the finite element model of the knee joint more applicable and provide more accurate simulation results for further research.

Key words: knee joint, finite element model, material assignment, model assumptions, meshing, load application

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