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首页> 外文期刊>Journal of athletic training >Neuromuscular Characteristics of Individuals Displaying Excessive Medial Knee Displacement
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Neuromuscular Characteristics of Individuals Displaying Excessive Medial Knee Displacement

机译：显示过度内侧膝关节置换的个体的神经肌肉特征

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Context: Knee-valgus motion is a potential risk factor for certain lower extremity injuries, including anterior cruciate ligament injury and patellofemoral pain. Identifying neuromuscular characteristics associated with knee-valgus motion, such as hip and lower leg muscle activation, may improve our ability to prevent lower extremity injuries. Objective: We hypothesized that hip and lower leg muscle-activation amplitude would differ among individuals displaying knee valgus (medial knee displacement) during a double-legged squat compared with those who did not display knee valgus. We further suggested that the use of a heel lift would alter lower leg muscle activation and frontal-plane knee motion in those demonstrating medial knee displacement. Design: Descriptive laboratory study. Setting: Research laboratory. Patients or Other Participants: A total of 37 healthy participants were assigned to the control (n = 19) or medial-knee-displacement (n = 18) group based on their double-legged squat performance. Main Outcome Measure(s): Muscle-activation amplitude for the gluteus maximus, gluteus medius, adductor magnus, medial and lateral gastrocnemius, and tibialis anterior was measured during 2 double-legged squat tasks. The first task consisted of performing a double-legged squat without a heel lift; the second consisted of performing a double-legged squat task with a 2-in (5.08-cm) lift under the heels. Results: Muscle-activation amplitude for the hip adductor, gastrocnemius, and tibialis anterior was greater in those who displayed knee valgus than in those who did not (P < .05). Also, use of heel lifts resulted in decreased activation of the gluteus maximus, hip adductor, gastrocnemius, and tibialis anterior muscles (P < .05). Use of heel lifts also eliminated medially directed frontal-plane knee motion in those displaying medial knee displacement. Conclusions: Medial knee displacement during squatting tasks appears to be associated with increased hip-adductor activation and increased coactivation of the gastrocnemius and tibialis anterior muscles.
机译：背景：膝外翻运动是某些下肢损伤的潜在危险因素，包括前十字韧带损伤和pa股疼痛。识别与膝外翻运动相关的神经肌肉特征，例如臀部和小腿肌肉的激活，可能会提高我们预防下肢受伤的能力。目的：我们假设在双腿深蹲期间表现出膝外翻（中膝关节位移）的人的髋部和小腿肌肉激活幅度与未表现出膝外翻的人不同。我们进一步建议，在显示内侧膝关节移位的人中，使用脚跟抬起将改变小腿肌肉的激活和额平面膝关节的运动。设计：描述性实验室研究。地点：研究实验室。患者或其他参与者：根据他们的双腿深蹲表现，将总共37名健康参与者分配为对照组（n = 19）或中膝关节置换（n = 18）组。主要观察指标：在两次双腿下蹲试验中，测量臀大肌，臀中肌，内收肌，内侧腓肠肌和外侧腓肠肌以及胫骨前肌的肌肉激活幅度。第一项任务是不抬脚而进行双腿下蹲。第二步包括执行双腿深蹲任务，并在脚跟下举起2英寸（5.08厘米）的举重。结果：显示膝外翻的患者的髋关节内收肌，腓肠肌和胫骨前肌的肌肉激活幅度要大于不显示膝外翻的患者（P <.05）。同样，使用脚后跟提升器会导致臀大肌，髋内收肌，腓肠肌和胫骨前肌的激活减少（P <.05）。在显示内侧膝关节位移的人中，使用脚后跟提升器还消除了朝向内侧的额叶前膝关节运动。结论：蹲蹲过程中膝关节内侧移位似乎与腓肠肌和胫骨前肌的髋内收肌激活增加以及共激活增加有关。

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