Kinematic Measurement of Normal Young Subjects’ Knees During Cycling Using 3D Fluoroscopy
Date Issued
2014
Date
2014
Author(s)
Wu, Yu-Huan
Abstract
In-vivo measurement of the three-dimensional (3D) kinematics during cycling is essential for the prevention of injuries due to overuse and improving the rehabilitation efficacy. The methods for measuring accurate 3D kinematics during cycling were still lacking. The purposes of the current study were to establish a platform for measuring knee kinematics during cycling based on the technique combining CT bone models and bi-planer fluoroscopy. Twelve normal young subjects were recruited, aiming to measure the knee kinematics during loaded and unloaded cycling. The thickness of the articular surfaces cartilage was calculated from MRI model and the surface kinematics was calculated. The elongation of simplified anterior cruciate ligament (ACL) and posterior cruciate ligament (PCL) changes were reported. And the reference lengths of the ligaments were determined by isolated knee flexion and extension motion.
The findings of the current research are as follows. The patterns of loaded and unloaded cycling are shown similar, but the flexion angles are significantly decreased especially during power phase under loaded cycling. The load also affected the position of the articular contact points on tibial plateau especially when knee flexion angle lower than 70°. The elongation of the simplified PCL was shown larger than that of ACL. The load did not affect the elongation of the ACL and PCL.
The established platform can be helpful f, and the knee kinematics presented in the research can be helpful for advanced study. Furthermore, the method used to define isometric fibre of ACL and PCL in this research may be useful to provide in vivo, noninvasive and subject-specific determination of the ligament replacement.
Subjects
動態X光
自行車運動
膝關節運動學
膝關節表面運動學
韌帶等長纖維
韌帶伸長量
Type
thesis
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