Department of Kinesiology, Department of Orthopedics and Rehabilitation, University of Wisconsin-Madison, 2031 Gymnasium-Natatorium, 2000 Observatory Dr, Madison, WI 53706, USA.
J Athl Train. 2013 Jul-Aug;48(4):442-9. doi: 10.4085/1062-6050-48.3.16. Epub 2013 May 31.
Two-dimensional (or medial knee displacement [MKD]) and 3-dimensional (3D) knee valgus are theorized to contribute to anterior cruciate ligament injuries. However, whether these displacements can be improved in the double-legged squat (DLS) after an exercise intervention is unclear.
To determine if MKD and 3D knee valgus are improved in a DLS after an exercise intervention.
Randomized controlled clinical trial.
Research laboratory.
A total of 32 participants were enrolled in this study and were randomly assigned to the control (n = 16) or intervention (n = 16) group. During a DLS, all participants demonstrated knee valgus that was corrected with a heel lift.
INTERVENTION(S): The intervention group completed 10 sessions of directed exercise that focused on hip and ankle strength and flexibility over a 2- to 3-week period.
MAIN OUTCOME MEASURE(S): We assessed MKD and 3D knee valgus during the DLS using an electromagnetic tracking system. Hip strength and ankle-dorsiflexion range of motion were measured. Change scores were calculated for MKD and 3D valgus at 0%, 10%, 20%, 30%, 40%, and 50% phases, and group (2 levels)-by phase (6 levels) repeated-measures analyses of variance were conducted. Independent t tests were used to compare change scores in other variables (α < .05).
The MKD decreased from 20% to 50% of the DLS (P = .02) and 3D knee valgus improved from 30% to 50% of the squat phase (P = .001). Ankle-dorsiflexion range of motion (knee extended) increased in the intervention group (P = .009). No other significant findings were observed (P > .05).
The intervention reduced MKD and 3D knee valgus during a DLS. The intervention also increased ankle range of motion. Our inclusion criteria might have limited our ability to observe changes in hip strength.
二维（或内侧膝位移[MKD]）和三维（3D）膝外翻被认为会导致前交叉韧带损伤。但是，在运动干预后，在双腿深蹲（DLS）中是否可以改善这些位移尚不清楚。
确定运动干预后 DLS 中 MKD 和 3D 膝外翻是否得到改善。
随机对照临床试验。
研究实验室。
共有 32 名参与者参加了这项研究，并被随机分配到对照组（n=16）或干预组（n=16）。在 DLS 期间，所有参与者都表现出膝外翻，通过脚跟抬高进行了纠正。
干预组在 2 到 3 周的时间内完成了 10 次针对髋关节和踝关节力量和柔韧性的定向运动。
我们使用电磁跟踪系统在 DLS 期间评估 MKD 和 3D 膝外翻。测量了髋关节力量和踝关节背屈活动范围。计算了 MKD 和 3D 外翻在 0%、10%、20%、30%、40%和 50%阶段的变化分数，并进行了组（2 个水平）-阶段（6 个水平）重复测量方差分析。使用独立 t 检验比较其他变量的变化分数（α<0.05）。
DLS 的 20%到 50%阶段 MKD 减小（P=0.02），3D 膝外翻从深蹲阶段的 30%到 50%阶段改善（P=0.001）。干预组的踝关节背屈活动范围（膝关节伸展）增加（P=0.009）。没有观察到其他显著发现（P>0.05）。
干预措施降低了 DLS 中的 MKD 和 3D 膝外翻。干预还增加了踝关节活动范围。我们的纳入标准可能限制了我们观察髋关节力量变化的能力。
