| Summary: | 碩士 === 國立臺灣大學 === 醫學工程學研究所 === 101 === The ankle joint plays a very important role in various functional movements of the human body. The lateral ligament damage often associated with ankle injury and it is easy to cause traumatic arthritis. It may bring the neighboring joints arthritis risk when selecting the total ankle replacement or fusion surgery to alleviate the pain. In the previous studies, multiple degrees of freedom arthrometer were used to quantify laxity and assess contribution of soft tissues in joint activities. Talus motion controlling makes rare robotic-based joint testing system (RJTS) used in the studies of the ankle joint.
In this study, we used RJTS to control joint motion by anterior drawer test and talar tilt test in different flexion angles on 3 ankle specimens before and after subtalar arthrodesis, then combined joint kinematic and kinetic data to compare the difference of laxity. After excluding the influence of talus moving, we can get ligament contribution by repeating path function of RJTS and superposition theory. After subtalar arthrodesis, joint became more stable. On the other hand, the DOF of ankle joint was lower. It affected varus/valgus rotation more than anterior/posterior displacement. The contribution of ATFL is limiting anterior displacement, the effect is more obvious when plantar flexion angle increases. With dorsiflexion angle increases, CFL restricted varus motion more that the moment became larger. Effect on joint motion of PTFL was less but it maintained joint stable with ATFL because of the shape and position. To achieve the normal ankle motion behavior, it must share the force which came from fixing talus with tibiotalar joints and surrounding soft tissues after subtalar arthrodesis. In addition to increasing the risk of injury, but also resulting in excessive wear of the articular surface of adjacent joint, and deriving arthritis.
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