目的：本研究目的為探討正常與慢性腳踝不穩定的受測者執行星型平衡測試（Star Excursion BalanceTest）時，姿勢控制的策略以及可能影響星型平衡測試碰觸距離的因子。方法：十五位慢性腳踝不穩定和十五位經過年齡配對的正常運動員參與本研究，並使用單腳碰觸八種不同方向。在動作測試執行過程中，使用了八台紅外線攝影機和一塊力板紀錄了運動學和地面反作用力的資料，以分析八個方向伸腳可及的距離、壓力中心內外和前後的位移量以及在最大碰觸距離時，膝關節、踝關節和髖關節的關節角度。另外，也量測踝關節和膝關節的肌力。結果：研究結果顯示，慢性腳踝不穩定組在蹠屈肌群的肌力和伸腳可及的距離大致都顯著小於健康組，且在前外側和外側方向的膝關節和髖關節都有較大的彎曲角度；兩組的腳踝被動背屈角度都和伸腳可及距離有正相關，在執行前外方向星型平衡測試時，慢性腳踝不穩組有較大的壓力中心前後位移，但是在執行正後方向時，卻有較小的壓力中心內外位移。結論：慢性腳踝不穩定的運動員執行星型平衡測試的表現比正常運動員差，且運動員在執行星型平衡測試的表現和腳伸到最遠距離時的最大踝關節、膝關節和髖關節的矢狀面關節角度及小腿肌肉的柔軟性有正相關。（物理治療2011;36(4):263-273）

Objective: To investigate postural control strategy in athletes with and without chronic ankleinstability (CAI) during Star Excursion Balance Test (SEBT) and to determine the possiblecontributing factors to the reaching distance of SEBT. Design: Controlled laboratory study. Setting:Motion Analysis Laboratory. Methods: Fifteen subjects with CAI and 15 uninjured agematchedathletes performed eight directional leg-reaching tasks of the SEBT. Eight infraredvideo cameras and one Kistler force plates were used to record the markers trajectories andground reaction force, respectively. Reaching distance of eight directions, the displacement ofanterior-posterior and medial-lateral center of pressure (COP), joint angle of the ankle, knee,and hip at maximum reaching distance, muscle strength of the ankle and knee joint muscleswere measured. Results: The CAI group had significantly smaller ankle plantar flexor strengthand reaching distance in the posterior-lateral, posterior, posterior-medial, anterior-medial, andmedial directions of the SEBT but had greater knee and hip flexion angle in the anterior-lateraland lateral directions. The passive range of motion of ankle dorsiflexion positively correlatedwith reaching distance in the majority of testing directions in both groups. The CAI group hadsignificantly greater anterior-posterior COP displacement in the anterior-lateral direction ofreaching but significantly smaller medial-lateral COP displacement in the posterior direction ofreaching than the control group. Conclusion: Athletes with CAI had inferior performance inSEBT to those without. The ankle, knee, and hip angles in the sagittal plane at peak reachingdistance and the flexibility of calf muscle contributed to the performance of the SEBT. (FJPT2011;36(4):263-273)