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  4. 結合動作分析及動態X光量測技術研究活體人工膝關節之生物力學(2/2)
 
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結合動作分析及動態X光量測技術研究活體人工膝關節之生物力學(2/2)

Date Issued
2005-07-31
Date
2005-07-31
Author(s)
呂東武  
DOI
932213E002118
URI
http://ntur.lib.ntu.edu.tw//handle/246246/22396
Abstract
Total knee arthroplasty has been the main choice of treatment for advanced degenerative knee osteoarthritis over the last few decades. It is essential to provide full functional performances to patients on total knee replacement (TKR) design. Due to ethical considerations and technical limitation, direct measurement of angles during motion and contact points of two components in the Total knee is difficult. The main purposes of the project are to develop a new technique that integrates video-fluoroscopy systems, motion analysis systems, forceplates and electromyography (EMG), as well as mathematical modeling and analysis for in vivo study of total knee biomechanics, providing more accurate and better descriptions of the TKR kinematics and kinetics during isolated joint movement and functional activities. Subjects with PS (posterior cruciate substituting) type TKR in one leg and CR (posterior cruciate retaining) type in another in the present study offer an exceptional opportunity for study of these two different types of knee designs without inter-subject variations, which is helpful for the clarification of the function of posterior cruciate ligament (PCL) in TKR’s. This project will be carried out in two parts (years). In the first part (year) of the project, a complete kinematic and kinetic measurement system integrating a video-fluoroscopy system and motion analysis equipments, namely infrared cameras, forceplates and EMG, was established. Patients with both PS and CR type TKR’s performed passive and active isolated joint movements and functional activities including gait and sit-to-stand while kinematic and kinetic data were measured. Kinematic and kinetic analysis of the lower limb with special attention on the interaction of the tibiofemoral was performed. In the second part, a new optimization method for model-based estimation of the three-dimensional kinematics of TKR using dynamic fluoroscopic data was developed. Comparisons of the accuracy and reliability of the new method with two existing methods was performed based on computer simulations and experimental data. Present study proposed a new technique for improving the accuracy of 3D pose estimation and accelerate computational process without manual operation. All 2D real data and projection silhouettes are warped to stick on 3D spherical surface before the matching process. Therefore, template matching based on shape invariant can be applied for perspective projection system and can divide 6 degrees of freedom (DOF) of model to calculate respectively. The results from the current study showed that the majority of patients experienced kinematics is not similar to those of a normal knee. However, the extent of lateral femoral condyle posterior rollback and the extent of axial rotation were less.
Publisher
臺北市:國立臺灣大學醫學工程學研究所
Type
report
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