In Vivo Three-Dimensional Finite Element Simulations and Analyses of the Knee Ligaments During Functional Activities
Date Issued
2010
Date
2010
Author(s)
Guo, Jer-An
Abstract
Knee joints play very important roles in human activities. The muscles, ligaments, soft tissue, and joint surfaces surround knees decide the kinematics of knees. Ligaments link a femur and a tibia, limiting the motion of the knee. During human activities, knee ligaments also sustain tensile forces.
The knee is commonly injured tissue while people apply improper forces to them during sport or daily activities. It is reported that the injuries in ligaments have the highest percentage of the injuries in knees. 85% percent of ligament-injury happened in anterior cruciate ligament. Therefore, people tried hardly to understand how ligaments take forces during body motions.
There were many researchers related to kinematics and kinetics of knee. According cadaveric research, researchers use the anterior draw test to realize the force and deformation of knee. In vivo researches have many limits, so reconstructing a computer model is common for calculating the force of ligaments. Due to the envelopment of computer, finite element methods have been a useful method to realize the biomechanics of knee.
The objective of this study was to calculate the stress distribution and the force of the in vivo knee ligaments through the use of a 3-D finite element method of the ligaments during the functional activities of knee. The ligaments of the knee were simulated as incompressible transversely isotropic hyperelastic materials. The dynamic information of the femur and tibia can be obtained through 3-D surface model to 2-D fluoroscopy image registration for the boundary condition of FEA. The finite element models of knee ligaments were validated by specimen experiments which were performed by laxity test using 6-degree robotic system.
Subjects
knee joint
3-D knee ligament models
finite element method
functional activities
Type
thesis
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