芭蕾舞者的踝足關節是最常見的肌肉骨骼傷害，而這些傷害會影響舞者的表現，進一步造成踝足關節的解剖結構及生物力學功能發生變化。儘管透過生物力學分析來評估及了解舞者動作表現的正常或代償機制是相當重要，尤其是在踝關節扭傷或足部變形方面，但至目前為止，對於芭蕾舞者這個族群的力學研究仍舊相當少。因此本研究的主要目的是探討芭蕾舞者在五個基本芭蕾舞蹈動作過程中的踝關節生物力學表現。
整個實驗的資料收集是利用一套三維動作分析系統及兩塊力板分別收取在舞蹈動作過程中的各個肢段動作及地面反作用力，且共有舞齡超過五年以上的十五位芭蕾舞者參與此研究。藉由收集的資料做進一步分析，可建立及了解舞蹈過程中的正常踝關節生物力學表現，而踝關節扭傷及足部變形的可能病因也可得到更進一步的理解。因此，此研究可提供臨床診斷及治療的輔助指導方針。
另外，各組動作間在最大角度及最大力矩、力矩範圍的差異性以及左右腳的對稱性也同時在此研究中探討。結果顯示，在各組動作間的最大角度有顯著差異性存在，除了pointé 和 passé這組例外；而在左右腳的比較上，兩腳最大角度只有在demi-pointé此動作有顯著差異性存在。若從動力學來看，左腳在動作過程中的力矩形態較右腳多，尤其是在pointé及grand-plié這兩個動作，這指出了這兩個動作的困難度較高且右腳踝關節在整個動作過程中對動作有較好的控制表現。

Foot and ankle injuries are the most common injuries in ballet dancers, which can influence dancers’ performances and lead to significant anatomical structure changes and biomechanical functions of the foot and ankle. Although, evaluation and understanding either normal or compensation mechanism of dance movements through biomechanical analysis is greatly important in discovering the etiology of ankle sprain and foot deformity, at present, few biomechanical studies have been conducted in this population. Therefore, the major objective of this study was to investigate the ankle biomechanics of ballet dancers in five fundamental dance movements, demi-pointé, relevé on pointé, grand-plié, demi-plié and passé. A three-dimensional (HIRE) motion analysis and two force platforms were used to collect data of segmental motion and ground reaction forces during these dance movements respectively. Fifteen ballet dancers, with dance years over five years, were investigated in this study. By means of the information, the normal ankle biomechanics of dance movements can be better understood, and the possible etiology of ankle sprain and foot deformity can be easily identified. Consequently, the information will provide additional guidelines for the clinical diagnosis and treatment.
The ROM and moment comparison between five dance movements and right-left symmetrical comparison were also investigated. The results showed that the maximal ankle ROM demanding was significant different between pair of movements except the pointé and passé pair. But in right-left comparison, the difference only existed in the demi-pointé group. From the kinetics points, the left ankle showed up more excursion patterns than right ankle especially in pointé and grand-plié movements. It meant the two movements were more difficult than others and right ankle had better control throughout the dance movements.
Biomechanical patterns of ballet dance movements had also been constructed in this study to help interpret and understand the excursion patterns of bilateral ankle joint.

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