Sex differences in valgus knee angle during a single-leg drop jump.
Sex differences in valgus knee angle during a single-leg drop jump.
复制标题
单腿跳高时膝外翻角度的性别差异。
DOI：
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复制
发表时间：
2006
影响因子：
3.3
通讯作者：
C. Ingersoll
中科院分区：
文献类型：
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作者：
Kyla A Russell;R. Palmieri;S. M. Zinder;C. Ingersoll
背景
下肢落地力学和肌肉激活的性别差异已被确定为导致女运动员前十字韧带损伤发生率增加的潜在致病因素。外翻膝关节排列比中性排列对前十字韧带造成更大的压力。臀中肌 (GM) 激活可以在着陆过程中稳定腿部和骨盆，限制膝关节外翻运动，并可能防止前十字韧带损伤。
目标
确定单腿落地过程中初始接触和最大膝关节弯曲时两性之间的额状膝关节角度和 GM 激活是否存在差异。
设计
组间设计。
设置
运动分析实验室。
患者或其他参与者
32 名年龄在 18 岁至 30 岁之间的健康受试者。
干预措施
自变量是性别（男性或女性）和位置（初始接触或最大膝关节弯曲）。
主要成果衡量标准
额面膝部角度和 GM 平均均方根 (aRMS) 幅度。
结果
初次接触时，女性以膝外翻着地，男性以膝内翻着地 (P < .025)。在膝关节最大屈曲时，男性和女性均处于膝内翻位置，但女性内翻的幅度小于男性 (P < .025)。膝关节最大屈曲时的 GM aRMS 振幅大于初始接触时的 GM aRMS 振幅 (P < .025)；然而，男性 GM aRMS 与女性 GM aRMS 幅度在任一位置均没有差异 (P > .025)。
结论
与男性相比，女性在撞击前和撞击时更容易发生膝外翻。 GM 肌肉的激活在性别之间没有差异，因此，似乎并不是膝外翻的性别差异的原因。女性膝关节过度外翻角度可能有助于解释前十字韧带损伤中的性别差异。
CONTEXT
Sex differences in lower extremity landing mechanics and muscle activation have been identified as potential causative factors leading to the increased incidence of anterior cruciate ligament injuries in female athletes. Valgus knee alignment places greater strain on the anterior cruciate ligament than a more neutral alignment. Gluteus medius (GM) activation may stabilize the leg and pelvis during landing, limiting valgus knee motion and potentially preventing anterior cruciate ligament injury.
OBJECTIVE
To determine if frontal-plane knee angle and GM activation differ between the sexes at initial contact and maximal knee flexion during a single-leg drop landing.
DESIGN
Between-groups design.
SETTING
Motion analysis laboratory.
PATIENTS OR OTHER PARTICIPANTS
Thirty-two healthy subjects between the ages of 18 and 30 years.
INTERVENTION(S)
The independent variables were sex (male or female) and position (initial contact or maximal knee flexion).
MAIN OUTCOME MEASURE(S)
Frontal-plane knee angle and GM average root mean square (aRMS) amplitude.
RESULTS
At initial contact, women landed in knee valgus and men landed in knee varus (P < .025). At maximal knee flexion, both men and women were in a position of knee varus, but the magnitude of varus was less in women than in men (P < .025). The GM aRMS amplitude was greater at maximal knee flexion than at initial contact (P < .025); however, male GM aRMS did not differ from female GM aRMS amplitude at either position (P > .025).
CONCLUSIONS
Women tended to land in more knee valgus before and at impact than men. The GM muscle activation did not differ between the sexes and, thus, does not appear to be responsible for the sex differences in knee valgus. The excessive valgus knee angles displayed in women may help to explain the sex disparity in anterior cruciate ligament injury.
影响因子：
2.4
作者：
Anderson, FC;Pandy, MG
通讯作者：
Pandy, MG