Changes in lower limb kinematics, kinetics, and muscle activity in subjects with functional instability of the ankle joint during a single leg drop jump
Changes in lower limb kinematics, kinetics, and muscle activity in subjects with functional instability of the ankle joint during a single leg drop jump
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DOI：
10.1002/jor.20235
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发表时间：
2006-10-01
影响因子：
2.8
通讯作者：
Caulfield, Brian
中科院分区：
文献类型：
--
作者：
Delahunt, Eamonn;Monaghan, Kenneth;Caulfield, Brian
本研究的目的是确定在跌倒跳跃过程中患有踝关节功能不稳(FI)的受试者在3D运动学、动力学和踝关节肌肉活动方面的差异。24名有踝关节FI主观主诉的受试者和24名非损伤对照组受试者进行了10次单腿落地跳跃。分析和比较两组在初始接触(IC)两侧200ms的两个时间段内，股直肌、腓骨长肌、胫骨前肌和比目鱼肌的运动学数据的时间和幅度、运动学数据的时间和积分肌电(IEMG)活动。在同一时期，FI受试者表现出明显的IC前腓骨长肌电活动的降低，并伴随着踝关节的额面运动的改变。在IC后，FI受试者在到达踝关节闭合堆积位置时的效率低于对照组受试者。两组地面反作用力的时间平均分量、峰值垂直分量和矢状力分量之间存在显著差异。在FI受试者中观察到的IC前腓骨长肌IEMG改变和踝关节内翻增加可以帮助解释为什么FI受试者在受到意想不到的地面接触时可能会遭受踝关节内翻损伤。在FI患者中观察到的运动学和运动学差异可能会导致重复损伤和对踝关节支撑结构的破坏。(C)2006年骨科研究会。
The purpose of this study was to identify differences in 3D kinematics, kinetics, and ankle joint muscle activity in subjects with functional instability (FI) of the ankle joint during a drop jump. Twenty-four subjects with the subjective complaint of FI of the ankle joint and 24 noninjured control subjects performed 10 single leg drop jumps onto a force-plate. Timing and magnitude of kinetic data, timing of kinematic data, and integrated EMG (IEMG) activity of the rectus femoris, peroneus longus, tibialis anterior, and soleus muscles during two 200-ms time periods either side of initial contact (IC) with the ground were analyzed and compared between groups. Subjects with FI demonstrated a significant decrease in pre-IC peroneus longus IEMG activity, which was accompanied by a change in frontal plane movement at the ankle joint during the same time period. Following IC, FI subjects were less efficient than control group subjects in reaching the closed packed position of the ankle joint. Significant differences were seen between the groups' time-averaged and peak vertical and sagittal components of ground reaction force. The altered pre-IC peroneus longus IEMG and increased inversion of the ankle joint observed in FI subjects could help to explain why subjects with FI may suffer from inversion injury to their ankle joint when subjected to an unanticipated ground contact. The kinematic and kinetic differences observed in subjects with FI may lead to repeated injury and damage to the supporting structures of the ankle joint. (c) 2006 Orthopaedic Research Society.