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研究生(外文):Chu-Fen Chang
論文名稱(外文):Biomechanical Evaluation of The Effect of Arch Supports on Flatfoot
指導教授(外文):Cheng-Kung Cheng
外文關鍵詞:functional and structural flatfootarch supportsarch indexground reaction force analysiskinematics and kinetics of the ankle joints
  • 被引用被引用:12
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The foot is the first part to respond to the ground reaction force during walking. Variations in foot alignment and motion will influence the normal biomechanical mechanism of the foot. Flatfoot is one of the common foot deformities. Because of the instability of the foot structure resulted from the collapse of the foot arch, the flatfoot patients are generally recommended to use the proper arch supports to support the flattened arch, improving foot structural stability and therefore biomechanical performance. Therefore, the aim of this study is evaluating the biomechanical effect of arch support on the flatfoot.
This study first carried out gait analyses using ultra-high resolution stereophotogrammetry system and forceplates to understand the immediate (15 minutes) and short-term (2 weeks) functional influence of prefabricated arch supports respectively on the ground reaction force, kinematics and kinetics of the ankle joints of the structural flatfoot and the functional flatfoot subjects, and then used the arch index confered on the short-term effects of the arch supports on the foot structure of the flatfoot subjects.
The results showed that the V2 values of flatfoot subjects were lower than those of normal ones which indicated that the propulsive force of flatfoot subjects during terminal stance phase was worse than normal one. Compared with functional flatfoot subjects, the propulsion of structural flatfoot subjects was poorer. There was no difference between gaits used arch supports for 15 min. and original gait. After using arch supports for 2 weeks, the stance/swing ratio of the functional flatfoot subjects was obviously higher than normal. However, from results of other parameters analysis, there was no modification resulting from arch supports influence in gait of functional flatfoot subjects. The V2 values of structural flatfoot subject were apparently lower than normal, indicating arch supports did not provide the these subjects with the propulsive ability of gait. The short-term results of arch index evidently showed that arch supports did not reform the foot arch alignment of the functional flatfoot and structural the flatfoot subjects.
In conclusion, adopting gait analysis and ground reaction force analysis could distinguish flatfoot from normal foot effectively. Additionally, the short-term effect of arch supports on the modification of foot arch structure of the flatfoot subjects was not significant, so it was necessary to carry out the long-term follow-up for confirmation of the biomechanical influence of the arch supports.
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