目的观察正常人和慢性踝关节不稳（CAI）患者踝关节位置觉和腓骨肌的反应时间，比较正常踝关节和受损关节间差异，评估本体感觉对踝关节功能的影响。 方法选取CAI患者21例（实验组）、踝关节正常人30例（对照组），在非负重静息状态、角速度2°/s条件下，利用踝关节被动位置觉角度重现法测定2组研究对象踝关节位置觉感应能力，并在佩戴与不佩戴护踝两种条件下模拟踝关节突然内翻，测定腓骨肌反应时间。 结果与对照组比较，实验组在设定内翻目标角度为20°、30°的条件下，其踝关节本体感觉位置觉角度差值均较对照组大，差异有统计学意义（P<0.05）。与对照组同等条件下比较，实验组在佩戴和不佩戴绷带式护踝条件下，腓骨长肌（PL）、腓骨短肌（PB）的肌肉反应时间（MRT）均较对照组高，差异有统计学意义（P<0.05）。2组受试者组内比较，佩戴与不佩戴绷带式护踝条件下PL、PB的MRT差异均统计学意义（P>0.05）。 结论慢性踝关节外侧不稳定患者位置觉感应能力下降，腓骨肌反应时间延长，护踝对于受损踝关节具有良好的机械性保护作用，但对于MRT没有显著提升作用。 Objective To evaluate how proprioception affect ankle stability through comparing angle position awareness and peroneus reaction time between chronic ankle lateral instability patients and healthy controls. Methods A total of 51 participants were recruited into an experimental group of 21 patients with chronic ankle lateral instability (17 males,aged 31.6±2.6) and a control group of 30 healthy counterparts (24 males,aged 34.2±2.3). All the participants were asked to reoccur passive ankle position under the angular velocity at 2 degree per second when they were resting with non-weight bearing in their recruited ankles. The muscle reaction time (MRT) of peroneus longus(PL) and peroneus brevis (PB) in all the recruited ankles was measured during sudden ankle inversion both with and without ankle protective brace wearing. ResultsThe difference between angle recurrence and the target angle (ankle inversion 20° and 30°) was significantly higher (P<0.05) in the experimental group compared to the control group. The average MRTs of PL and PB were also significantly longer (P<0.05) in the experimental group than the control group, whether wearing ankle protective braces or not. However, within both groups, no significant differences of PL and PB′s MRT were identified between brace wearing and no brace (P>0.05). ConclusionsIn patients with chronic lateral ankle instability, the position awareness decreases and the reaction time of peroneus is prolonged. Ankle braces can provide mechanical protection to the injured joints, but cannot promote MRT significantly
