Method for establishing individualized knee joint bionic ligament biomechanical model

Abstract

The invention discloses a method for establishing an individualized knee joint bionic ligament biomechanical model. The method comprises the following steps: acquiring three-dimensional image originaldata of an individualized knee joint; reconstructing an individualized knee joint digital model; establishing a knee joint coordinate system; calculating to obtain a mechanical relationship between ligament stress and a structure by utilizing the knee joint coordinate system; then, importing ligament material parameters into the individualized knee joint digital model in a variable parameter form; recording forward displacement of the tibia relative to the femur under a drawer test, fitting a result measured by the in-vivo knee joint drawer test with a simulation result of the individualizedknee joint digital model, and obtaining an optimal value of the individualized bionic ligament material parameter; and establishing an individualized knee joint bionic ligament mechanical model. The ligament stress conditions of the individualized knee joint in different motion states are known, different injury modes of the knee joint ligament in clinical research are simulated, and clinical guidance is provided for prevention, diagnosis, treatment and rehabilitation of individualized knee joint ligament injuries.

Description

technical field [0001] The invention relates to the technical field of joint modeling, in particular to a method for establishing an individualized knee joint bionic ligament biomechanical model. Background technique [0002] The knee joint is one of the most important joints in the human body, which is used for walking, running, long jump, etc. The complex mechanical relationship formed between the articular surface of the knee joint and its surrounding muscles and ligaments controls the movement of the knee joint, and at the same time controls the stability and mobility of the knee joint. [0003] Because the knee joint is located in the lower limbs of the human body, it bears a large load during exercise, and athletes are usually injured most frequently. In the knee joint injury, the highest proportion is the ligament injury. According to incomplete statistics, 85% of the knee joint injury is the anterior fork ligament injury, and the remaining 15% of the knee joint inju...

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Problems solved by technology

[0004] For example, the application number is CN201910780245, which discloses a finite element modeling method of the whole knee joint. Most of the finite element models of the knee joint mainly include the bony structures of the knee joint, such as the tibia and femur, while ignoring the more complex structures of the knee joint. ligaments; the material properties of the ligament tissue of a small part of the knee joint finite element model with ligaments, in order to facilitate the simulation calculation of the finite element model, the default is isotropic, uniform, and linear of the ligament, but the real ligament tissue material is Anisotropic, inhomogeneous, and nonlinear; the current digital model of the knee joint is limited by individual material properties, lacks accurate in-body boundary conditions, and cannot reproduce real in-body motion

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