de Noronha Marcos, Refshauge Kathryn M, Crosbie Jack, Kilbreath Sharon L
School of Physiotherapy, The University of Sydney, Australia.
J Orthop Sports Phys Ther. 2008 Dec;38(12):782-9. doi: 10.2519/jospt.2008.2766.
Controlled laboratory study using a cross-sectional design.
To investigate the relationship between postural control and functional ankle instability during a hop-landing task, and to investigate whether postural control is altered in people with functional ankle instability.
Sixty volunteers classified by the Cumberland Ankle Instability Tool (CAIT) scores formed the external control group (CAIT score, >or= 28, n = 31) and the instability group (CAIT score, <or= 27 and history of at least 1 ankle sprain; n = 29). Postural control was measured with the landing test, in which participants stood on 1 lower extremity for 3 seconds on a step, then hopped down onto a force plate and regained postural stability after landing. The main outcome measurements were time to stability (TTS) after landing for ankle inversion, dorsiflexion, and summated electromyographic (EMG) signal amplitude for the tibialis anterior, soleus, and fibularis longus. The secondary outcomes were the proportion of movement in the frontal plane for hip and ankle, the variability of inversion movement prior to hopping, and the variables from ground reaction force.
There were no associations (P > .05) between the CAIT scores and the TTS for ankle inversion (r = -0.25), dorsiflexion (r = -0.04), summated EMG (r = -0.13) and proportion of movement in the frontal plane (r = 0.005). Participants in the instability group took longer to regain stability in inversion and displayed greater inversion variability prejump than the control group (P = .05 and .009, respectively).
Ankle inversion control is affected in people with functional ankle instability in tasks of postural control after landing from a hop.
采用横断面设计的对照实验室研究。
探讨单腿跳落地任务中姿势控制与功能性踝关节不稳之间的关系，以及功能性踝关节不稳患者的姿势控制是否发生改变。
根据坎伯兰踝关节不稳工具（CAIT）评分将60名志愿者分为外部对照组（CAIT评分≥28分，n = 31）和不稳组（CAIT评分≤27分且有至少1次踝关节扭伤史；n = 29）。通过落地测试测量姿势控制，即参与者在台阶上用单下肢站立3秒，然后跳下至测力板并在落地后恢复姿势稳定。主要结局测量指标为落地后踝关节内翻、背屈的稳定时间（TTS），以及胫骨前肌、比目鱼肌和腓骨长肌的肌电图（EMG）信号总和振幅。次要结局指标为髋部和踝关节在额状面的运动比例、单腿跳前内翻运动的变异性以及地面反作用力的相关变量。
CAIT评分与踝关节内翻（r = -0.25）、背屈（r = -0.04）、EMG信号总和（r = -0.13）以及额状面运动比例（r = 0.005）的TTS之间均无相关性（P > 0.05）。与对照组相比，不稳组参与者内翻恢复稳定的时间更长，且单腿跳前内翻变异性更大（分别为P = 0.05和0.009）。
在单腿跳落地后的姿势控制任务中，功能性踝关节不稳患者的踝关节内翻控制受到影响。
