Abstract
In order to solve the problem of sports injury modeling of the anterior cruciate ligament, a method based on the intelligent finite element algorithm is proposed. Considering the transverse isotropy of the ligament, this paper constructs a 3D finite element model of the knee joint based on medical image data. The same ligament constitutive equation was used to fit the parameters of stress-strain mechanical experimental curves of three different anterior cruciate ligaments, and the effects of different anterior cruciate ligament mechanical parameters on kinematics and biomechanical properties of the knee joint were compared. The experimental results show that, in models 1, 2, and 3, the maximum stress values appear in the posterolateral of the femoral attachment area of the ligament, which are 16.24 MPa, 16.36 MPa, and 22.05 MPa, respectively. However, the stress values at the tibial attachment area are 9.80, 13.8, and 13.93 MPa, respectively, and the stress values at the anterolateral part of the middle ligament are 6.36, 11.89, and 12.26 MPa, respectively, which are all smaller than those at the femoral attachment area, which also quantitatively explains the clinical phenomenon that ACL fracture often occurs in the femoral attachment area in practice. Thus, the three-dimensional finite element model of the knee joint highly simulates the structure and material properties of the knee joint. This method proves that the intelligent finite element algorithm can effectively solve the modeling problem of sports injury of the anterior cruciate ligament.
Highlights
Knee joint is because of its complex structure and because of its complex biomechanical properties
E obtained medical images are saved in the DICOM format, and the 3D knee joint model is reconstructed by importing 3D reconstruction software Mimics 13.1 (Materialise, Belgium). e model includes the main tissues of the knee joint: femur, tibia, cartilage, meniscus, anterior cruciate ligament, posterior cruciate ligament, medial collateral ligament, and lateral collateral ligament. e reconstructed three-dimensional knee joint model was introduced into finite element software ABAQUS 6.10 (Dassault Systemes Simulation Company, USA) to divide the second-order tetrahedron element, and the three-dimensional finite element model of the knee joint was obtained [8]
In order to analyze the influence of ACL mechanical properties on the whole displacement of the knee joint and the stress distribution of intra-articular tissues, according to the existing ACL mechanical property curves, this paper constructs three-dimensional finite element models of the knee joint with three different ACL properties. e finite element simulation results of the knee joint under 134 N femoral backward thrust load are obtained
Summary
More and more people are aware of its importance and related diseases, and their research is getting deeper and deeper. Knee joint is because of its complex structure and because of its complex biomechanical properties. With the further improvement of people’s understanding of the importance of knee joint injury, people pay more and more attention to the study of biomechanical properties of the knee joint. E traditional experimental method of isolated specimens has contributed to the biomechanical study of the anterior cruciate ligament, but there are still many defects, such as some physiological and pathological conditions are difficult to simulate, and the stress measurement is not accurate enough. With the further improvement of people’s understanding of the importance of knee joint injury, people pay more and more attention to the study of biomechanical properties of the knee joint. e traditional experimental method of isolated specimens has contributed to the biomechanical study of the anterior cruciate ligament, but there are still many defects, such as some physiological and pathological conditions are difficult to simulate, and the stress measurement is not accurate enough. e finite element analysis method has incomparable advantages over the in vitro specimen experiment and effectively makes up for the deficiency of the in vitro experiment [3]
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