目的：本研究旨在探討雙侧内侧退化性膝關節炎個案行走時穿戴外侧楔形鞋 墊搭配足弓墊對於動態平衡的立即效果。 方法：本研究納入15名被診斷為雙侧内侧退化性膝關節炎女性以及15名對 照組女性。使用高速紅外線攝影機與測力板紀錄受試者穿戴鞋墊行走時的運動學 資料與地面反作用力。以代表身體質量中心與壓力中心間相對距離以及速度之傾 角與傾角變化率量測動態穩定的變化。 結果：穿戴外侧楔形鞋墊搭配足弓墊後，前後方向的傾角與傾角變化率變小， 侧向方向的傾角則變大。 結論：雙侧内侧退化性膝關節炎個案穿戴外侧楔形鞋墊搭配足弓墊有利於行 走時前後動態穩定，但會增加維持侧向動態穩定的需求。因此，建議外侧楔形鞋墊 搭配足弓墊的使用者應接受平衡訓練，且未來的研究應探討外侧楔形鞋墊搭配足 弓墊對於其他難度高於行走之移行活動的影響，例如：跨越障礙物、上坡行走。

Objective: This study aimed to investigate the immediate effects of laterally-wedged insoles with arch support (LWAS) on dynamic stability during level walking in people with bilateral medial knee osteoarthritis (OA). Methods: Fifteen women with bilateral medial knee OA and 15 healthy control subjects were recruited. A 6-camera motion analysis system and 2 forceplates were used to record the kinematic data and ground reaction force when subjects walked with LWAS. The inclination angles (IA) and the rate of change of IA (RCIA), representing the relative distance and velocity between the body's center of mass and the center of pressure, were calculated for evaluating changes in dynamic stability. Results: Wearing LWAS decreased the IA and RCIA in the anterior-posterior (A/P) direction. In the medial-lateral (M/L) direction, the IA during transition from single leg stance to double leg stance was greater. Conclusion: For people with bilateral medial knee OA, the LWAS may improve A/P dynamic stability during level walking; however, the increased demand in maintenance of M/L dynamic stability was found. Thus, it is suggested that the balance training program might be required for user of LWAS to improve balance, and the effects of LWAS on other locomotion with more difficulty than level walking, such as obstacle crossing and uphill walking, should be addressed in future studies.