Role of Anterior Talofibular Ligament on the Contact Mechanics of the Ankle Joint
Date Issued
2014
Date
2014
Author(s)
Jian, Shuo-Chen
Abstract
The ankle joint plays a very important role in the control of the body motion while sustaining several times of the body weight during various of daily activities, such us walking and running. Among the sport injuries of the lower extremities, ankle sprain is the most frequent injury. Without suitable treatment, the injured ankle may suffer from recurrent sprain. An epidemiological study showed that as much as 73 % of athletes had the problem of recurrent ankle sprain. Lateral ligament injuries of the ankle joint had been found to alter the normal kinematic patterns of the joint. Abnormal kinematics of the ankle joint may contribute to the lesion of the articular cartilage.
The main target of the study is to measure the deformation of articular surface and the mechanical interaction between ligament and articular surface under external loads. The study combined the digital image correlation system (DIC), biomedical image process, and robotic-based joint testing system (RJTS). There will also cut the Anterior Talofibular Ligaments (ATFL) to observe the influence of the ATFL in deformation of articular surface. First, we used RJTS to control joint motion by anterior drawer test and talar tilt test in different flexion angles ankle specimen. After draw test, orthopedist will remove ligaments and expose the articular surface and then Coating random speckle on the articular surface. The photo can be reconstructed to the three-dimensional surface by DIC system. The dynamic bone surface data will combine with articular surface data. The thickness of the articular surface can be revealed by the difference between CT model and the articular surface data, and the deformation of the articular surface in dynamic equals to the interlaced parts. Finally, we can research the mechanical interaction between ligaments and articular surface under external loads to get more biomechanical information.
The results suggested that the contact area of the ankle cartilage was getting smaller in anterior drawer test and varus test after ATFL cutting. The average deformation of ankle cartilage was getting larger in anterior drawer test after ATFL cutting. Too much deformation and the small contact area will increase the risk of injury and also resulting in excessive wear of the articular surface of adjacent joint and deriving arthritis.
Subjects
踝關節
機械手臂關節測試系統
數位影像相關法
前距腓韌帶
Type
thesis
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