Tropp H, Odenrick P
Department of Clinical Neurophysiology, Linköping University, Sweden.
J Orthop Res. 1988;6(6):833-9. doi: 10.1002/jor.1100060607.
Postural control in single-limb stance has previously been shown to be impaired among soccer players with functional instability (FI) of the ankle joint. The aim of the present study was to further study the role of the ankle in postural control. A dynamic method was used involving optoelectronic movement recordings of body segments and force-plate recordings of the reaction ground force. Surface electromyography was recorded for the peroneus longus muscle. Thirty physically active men were selected. Fifteen of them had FI of the ankle chosen for recording. The results show that different patterns exist for maintaining equilibrium in single-limb stance. The ankle has a central role for postural corrections. The position of center of pressure is highly correlated to the position of the ankle and peroneal muscle activity. When the body was in disequilibrium, corrections were made at the hip. It is proposed that a change from an inverted pendulum model to a multisegmental chain model takes place when adjustments at the ankle joint no longer suffice to maintain postural control. The men with FI showed impaired postural control associated with increased upper segmental corrections.
先前的研究表明，踝关节功能不稳定（FI）的足球运动员在单腿站立时的姿势控制存在受损情况。本研究的目的是进一步探讨踝关节在姿势控制中的作用。采用了一种动态方法，包括身体各部位的光电运动记录和地面反作用力的测力板记录。记录了腓骨长肌的表面肌电图。选取了30名身体活跃的男性。其中15人选择了有FI的踝关节进行记录。结果表明，单腿站立时维持平衡存在不同模式。踝关节在姿势矫正中起核心作用。压力中心的位置与踝关节位置和腓骨肌活动高度相关。当身体失衡时，在髋关节处进行矫正。有人提出，当踝关节的调整不再足以维持姿势控制时，会从倒立摆模型转变为多节段链模型。有FI的男性表现出姿势控制受损，且上节段矫正增加。
