Pionnier Raphaël, Découfour Nicolas, Barbier Franck, Popineau Christophe, Simoneau-Buessinger Emilie
Laboratoire d'Automatique, de Mécanique, et d'Informatique industrielles et Humaines (LAMIH) - UMR CNRS 8201, Université de Valenciennes et du Hainaut-Cambrésis (UVHC), F-59313 Valenciennes, France; Laboratoire d'analyse du mouvement, Centre Hospitalier de la Région de Saint-Omer, F-62505 Saint-Omer Cedex, France.
Laboratoire d'analyse du mouvement, Centre Hospitalier de la Région de Saint-Omer, F-62505 Saint-Omer Cedex, France.
Gait Posture. 2016 Mar;45:97-102. doi: 10.1016/j.gaitpost.2016.01.013. Epub 2016 Jan 21.
The purpose of this study was to quantitatively and qualitatively assess dynamic balance with accuracy in individuals with chronic ankle instability (CAI). To this aim, a motion capture system was used while participants performed the Star Excursion Balance Test (SEBT). Reached distances for the 8 points of the star were automatically computed, thereby excluding any dependence to the experimenter. In addition, new relevant variables were also computed, such as absolute time needed to reach each distance, lower limb ranges of motion during unipodal stance, as well as absolute error of pointing. Velocity of the center of pressure and range of variation of ground reaction forces have also been assessed during the unipodal phase of the SEBT thanks to force plates. CAI group exhibited smaller reached distances and greater absolute error of pointing than the control group (p<0.05). Moreover, the ranges of motion of lower limbs joints, the velocity of the center of pressure and the range of variation of the ground reaction forces were all significantly smaller in the CAI group (p<0.05). These reduced quantitative and qualitative performances highlighted a lower dynamic postural control. The limited body movements and accelerations during the unipodal stance in the CAI group could highlight a protective strategy. The present findings could help clinicians to better understand the motor strategies used by CAI patients during dynamic balance and may guide the rehabilitation process.
本研究的目的是对慢性踝关节不稳（CAI）个体的动态平衡进行准确的定量和定性评估。为此，在参与者进行星形偏移平衡测试（SEBT）时使用了动作捕捉系统。自动计算星形的8个点的到达距离，从而排除了对实验者的任何依赖。此外，还计算了新的相关变量，如到达每个距离所需的绝对时间、单足站立时下肢的运动范围以及指向的绝对误差。借助测力板，在SEBT的单足阶段还评估了压力中心的速度和地面反作用力的变化范围。与对照组相比，CAI组的到达距离更小，指向的绝对误差更大（p<0.05）。此外，CAI组下肢关节的运动范围、压力中心的速度和地面反作用力的变化范围均显著更小（p<0.05）。这些定量和定性表现的降低突出了较低的动态姿势控制。CAI组在单足站立期间有限的身体运动和加速度可能突出了一种保护策略。本研究结果有助于临床医生更好地理解CAI患者在动态平衡过程中使用的运动策略，并可能指导康复过程。
