Department of Rehabilitation Sciences, University of Kentucky, Lexington, KY 40536, USA.
J Athl Train. 2011 Jul-Aug;46(4):376-85. doi: 10.4085/1062-6050-46.4.376.
Researchers have observed that medial knee collapse is a mechanism of knee injury. Lower extremity alignment, sex, and strength have been cited as contributing to landing mechanics.
To determine the relationship among measurements of asymmetry of unilateral hip rotation (AUHR); mobility of the foot, which we described as relative arch deformity (RAD); hip abduction-external rotation strength; sex; and medial collapse of the knee during a single-leg jump landing. We hypothesized that AUHR and RAD would be positively correlated with movements often associated with medial collapse of the knee, including hip adduction and internal rotation excursions and knee abduction and rotation excursions.
Descriptive laboratory study.
Research laboratory.
Thirty women and 15 men (age = 21 ± 2 years, height = 171.7 ± 9.5 cm, mass = 68.4 ± 9.5 kg) who had no history of surgery or recent injury and who participated in regular physical activity volunteered.
INTERVENTION(S): Participants performed 3 double-leg forward jumps with a single-leg landing. Three-dimensional kinematic data were sampled at 100 Hz using an electromagnetic tracking system. We evaluated AUHR and RAD on the preferred leg and evaluated isometric peak hip abductor-external rotation torque. We assessed AUHR by calculating the difference between internal and external hip rotation in the prone position (AUHR = internal rotation - external rotation). We evaluated RAD using the Arch Height Index Measurement System. Correlations and linear regression analyses were used to assess relationships among AUHR, RAD, sex, peak hip abduction-external rotation torque, and kinematic variables for 3-dimensional motion of the hip and knee.
MAIN OUTCOME MEASURE(S): The dependent variables were joint angles at contact and joint excursions between contact and peak knee flexion.
We found that AUHR was correlated with hip adduction excursion (R = 0.36, P = .02). Asymmetry of unilateral hip rotation, sex, and peak hip abduction-external rotation torque were predictive of knee abduction excursion (adjusted R(2) = 0.47, P < .001). Asymmetry of unilateral hip rotation and sex were predictive of knee external rotation excursion (adjusted R(2) = 0.23, P = .001). The RAD was correlated with hip adduction at contact (R(2) = 0.10, R = 0.32, P = .04) and knee flexion excursion (R(2) = 0.11, R = -0.34, P = .03).
Asymmetry of unilateral hip rotation, sex, and hip strength were associated with kinematic components of medial knee collapse.
研究人员观察到，膝关节内侧塌陷是膝关节损伤的一种机制。下肢对线、性别和力量被认为是影响着陆力学的因素。
确定单侧髋关节旋转不对称（AUHR）测量值与足部活动度（我们称之为相对足弓畸形（RAD））之间的关系；髋关节外展-外旋力量；性别；以及单腿跳落地时膝关节内侧塌陷。我们假设 AUHR 和 RAD 将与膝关节内侧塌陷经常相关的运动呈正相关，包括髋关节内收和内旋运动以及膝关节外展和旋转运动。
描述性实验室研究。
研究实验室。
30 名女性和 15 名男性（年龄=21±2 岁，身高=171.7±9.5cm，体重=68.4±9.5kg），无手术或近期受伤史，经常参加体育活动。
参与者进行了 3 次双腿向前跳跃，然后单腿着地。使用电磁跟踪系统以 100Hz 的速度采集三维运动学数据。我们在优势腿上评估 AUHR 和 RAD，并评估等距最大髋关节外展-外旋扭矩。我们通过计算仰卧位时髋关节内旋和外旋的差值来评估 AUHR（AUHR=内旋-外旋）。我们使用足弓高度指数测量系统评估 RAD。我们使用相关和线性回归分析来评估 AUHR、RAD、性别、最大髋关节外展-外旋扭矩以及髋关节和膝关节三维运动的关节角度在接触时和接触与最大膝关节屈曲之间的关节运动。
因变量为接触时的关节角度和接触与最大膝关节屈曲之间的关节运动。
我们发现 AUHR 与髋关节内收运动幅度呈正相关（R=0.36，P=0.02）。单侧髋关节旋转不对称、性别和最大髋关节外展-外旋扭矩是膝关节外展运动幅度的预测因素（调整后的 R(2)=0.47，P<0.001）。单侧髋关节旋转不对称和性别是膝关节外旋运动幅度的预测因素（调整后的 R(2)=0.23，P=0.001）。RAD 与接触时髋关节内收（R(2)=0.10，R=0.32，P=0.04）和膝关节屈曲运动幅度（R(2)=0.11，R=-0.34，P=0.03）相关。
单侧髋关节旋转不对称、性别和髋关节力量与膝关节内侧塌陷的运动学成分有关。
