Establishment of finite element model of knee joint based on CT and MRI and analysis of biomechanical characteristics under different loads(PDF)
《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]
- Issue:
- 2021年第3期
- Page:
- 370-374
- Research Field:
- 生物材料与力学
- Publishing date:
Info
- Title:
- Establishment of finite element model of knee joint based on CT and MRI and analysis of biomechanical characteristics under different loads
- Author(s):
- HANG Shengqi1; ZHANG Wentao2; WANG Taiqi1; REN Jiancheng1; LI Fuchao1; ZHAO Gaiping1; MA Tong3
- 1. School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China 2. School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China 3. Department of Orthopedics, Yangpu Hospital Affiliated to Tongji University, Shanghai 200090, China
- Keywords:
- Keywords: computed tomography magnetic resonance imaging knee joint biomechanical characteristics varus and valgus torques contact stress hexahedral mesh finite element analysis
- PACS:
- R318
- DOI:
- DOI:10.3969/j.issn.1005-202X.2021.03.019
- Abstract:
- Abstract: Based on CT and MRI image data, a finite element model of the knee joint is established, and hexahedral mesh is used to analyze the biomechanical characteristics of human knee joint under different loads, thereby verifying the validity of the model. The established knee joint finite element model includes femur, tibia, patella, fibula, femoral cartilage, fibula cartilage, meniscus, anterior and posterior cruciate ligament, medial and lateral collateral ligament, patellar ligament and femoral quadriceps tendon. After the knee joint is applied with 1 kN axial compression load, 134 N in posterior drawer test, and 5, 10, 15 N·m varus and valgus torques, the contact stress and contact area of the internal cartilage and the meniscus of the knee joint, femoral varus angles and valgus angles are analyzed, and the displacement of the knee joint is measured. Under 1 kN compression load and 134 N in drawer test, the peak contact stresses of femur cartilage, medial and lateral meniscus, and medial and lateral tibial cartilage are 4.47, 3.25, 2.83, 2.70 and 2.53 MPa, respectively, with peak Von Mises stresses of 2.22, 2.44, 2.25, 2.07 and 1.64 MPa, respectively. The displacement of femur relative to tibia is 4.19 mm. When applying 5, 10 and 15 N·m varus and valgus torques, femoral varus and valgus angles are 3.49°, 4.48°, 4.91°, and 3.22°, 3.62°, 4.01°, respectively. With the linear increase of torque, the stress of each component of the knee joint presents a nonlinear change trend. The analysis results of knee articular cartilage, meniscus and ligaments are in accordance with their biomechanical properties, which is consistent with the previous results of numerical analysis and experimental studies. The established model can provide a certain theoretical basis for the physiological and pathological analyses on knee joint and its treatment research.
Last Update: 2021-03-30