踝關節扭傷是常見的運動傷害之一，主要發生在反覆跳躍與側向移動的著地階段，重複扭傷的患者可能發展成慢性踝關節不穩定 (chronic ankle instability, CAI) 族群。過去對於踝關節不穩定的相關研究大多是探討沒有扭傷經驗的健康人與不穩定族群之間的差異，但是很少針對曾經扭傷但踝關節沒有出現不穩定的族群來進行研究，其可能存在不同的動作機制，因此本研究會增加有過一次扭傷經驗的參與者作為潛在組(Copers)，藉由連續側向跳測試，觀察踝關節健康組、潛在組與不穩定組彼此間的運動特徵。目的:本研究透過連續側向跳來檢測踝關節健康、潛在風險與不穩定的運動員其踝關節的運動特徵，藉以提供未來更完善的踝關節傷害預防指標。方法：招募30位運動員，以Cumberland踝關節不穩定問卷調查、前抽拉測試 (Anterior drawer test) 與內翻測試 (Inversion test) 來分類出健康組、潛在組與不穩定組，隨後進行兩種不同著地方向的單腳連續側向跳測試，其跳躍距離設定為受試者的髂前上棘兩側距離的210%，利用10台Vicon 紅外線攝影機 (200 Hz) 與2塊Kistler測力板 (1000 Hz) 同步收集著地期的運動學的資料；使用二因子混和設計變異數分析 (Two-way ANOVA) 比較著地方向與組別交互作用及各個組別、著地方向之間差異，若達顯著則考驗單純主要效果，若無則比較主要效果，各項統計考驗的顯著水準均為α = .05。研究結果顯示蹠曲角度在組別與方向間達顯著交互作用，蹠曲ROM角度Healthy顯著大於CAI。CAI組可能在反覆扭傷後導致腳踝結構鬆弛，為了避免二次傷害所產生代償作用，使踝關節活動度縮小， 因此踝關節的緩衝能力較差，增加受傷風險。

Ankle sprain is one of the most common sports injuries, major in the repeated jump and lateral movement of the landing phase, recurrent sprained patients may develop into chronic ankle instability (chronic ankle instability, CAI) groups. Most of the previous studies of ankle instability were investigated differences between healthy and unstable groups without ankle sprained experience, but rarely studied for groups that have been sprained and not unstable in the ankle joint, it might exist different motion mechanisms.Thus this study will increase the ankle sprained experience participants as potential group (Coper).The dynamic characteristics of health control group, the coper group and the CAI group were observed by continuous lateral jump test. OBJECTIVE:The purpose of this study was to investigate the difference of continuous medial-lateral hopping landing pattern among the healthy control, copers, and CAI groups., to provide a better prognostic index for ankle injury in the future. METHODS: A total of 30 athletes were recruited. The Cumberland Ankle Instability Tool, the Anterior drawer test and the Inversion test were used to classify the health group, coper group and the CAI group, followed by two The jump distance was set to 210% of the distance between the anterior superior iliac spine of the subject, ten Vicon infrared cameras (200 Hz) and two Kistler force platform (1000 Hz) were used Were synchronized to acquire the kinematic data during jump landing . The statistical method was used two-way mixed analysis of variance (ANOVA) to compare the different between the direction of landing and each group, the level of statistical significance was set at P < .05. The results indicated that angle of plantar flexion had significant interaction effects between group and direction of landing. The healthy group demonstrated a greater range of motion of plantar flexion compared to CAI. CAI group after repeated sprains lead to ankle structure laxity, in order to avoid re-injury generated a compensatory effect, so that ankle range of motion reduced, so the ankle joint cushioning capacity is poor, increasing the risk of injury.

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