摘要
目的探究动态膝外翻(dynamic knee valgus,DKV)女性在跑步着地阶段的动态稳定性与刚度特征,揭示动态稳定性与关节刚度之间的联系,为DKV女性的损伤预防和康复提供理论依据和实践参考。方法根据膝外翻角度进行组别划分,膝外翻角超过13°为DKV组(n=16),膝外翻角0°~13°为正常人群组(n=16)。采用三维动作捕捉系统、三维测力台和无线表面肌电系统测量跑步时运动学、动力学及肌电数据,计算动态稳度(margin of stability,MoS)、关节刚度与肌电指标,并进行组间差异性检验和相关性分析。结果与正常女性相比,DKV女性矢状面膝关节峰值力矩、冠状面膝关节角度变化量均较大(P<0.05);DKV女性冠状面MoS、膝关节刚度、踝关节刚度均较小(P<0.05)。着地前,DKV女性臀中肌、股外侧肌的肌肉预激活程度低于正常女性(P<0.05),腓肠肌外侧肌的预激活程度高于正常女性(P<0.01);着地后,DKV女性髋关节周围肌肉共激活比高于正常女性(P<0.01);正常女性冠状面MoS与冠状面髋关节刚度之间存在高度负相关(r=-0.634,P=0.048);DKV女性冠状面MoS与冠状面髋关节刚度(r=-0.600,P=0.042)、矢状面踝关节刚度(r=-0.673,P=0.024)呈高度负相关。结论跑步时,DKV女性在冠状面表现出动态稳定性下降和膝、踝关节刚度不足的特征,存在潜在损伤风险;为代偿近端关节的控制不足,DKV女性在着地前会增加远端关节肌肉的激活程度,以防止冠状面动态稳定性及膝、踝关节刚度进一步下降。DKV女性跑步时动态稳定性与关节刚度存在高度负相关,当身体在冠状面处于不稳定状态时,通过提高矢状面踝关节刚度和冠状面髋关节刚度以维持身体整体稳定性。
Objective To investigate the dynamic stability and stiffness characteristics of females with dynamic knee valgus(DKV)during the landing phase of running,and to reveal the relationship between dynamic stability and joint stiffness,thereby providing theoretical and practical foundations for injury prevention and rehabilitation.Methods Participants were divided into two groups based on their knee valgus angle:the DKV group(n=16),with a knee valgus angle exceeding 13°;and the normal group(n=16),with a knee valgus angle ranging from 0°to 13°.A three-dimensional(3D)motion capture system,3D force platform,and wireless surface electromyography system were used to collect kinematic,kinetic,and electromyographic data during running.The margin of stability(MoS),joint stiffness,and electromyographic indicators were calculated,followed by correlation analyses and statistical tests for differences between groups.Results Compared with normal females,females with DKV exhibited greater peak knee joint moments in the sagittal plane and larger changes in knee joint angles in the frontal plane(P<0.05).Additionally,females with DKV exhibited reduced MoS,knee joint stiffness,and ankle joint stiffness in the frontal plane(P<0.05).Prior to landing,the pre-activation levels of the gluteus medius and vastus lateralis were lower in the DKV group than in the normal group(P<0.05),whereas the pre-activation level of the lateral gastrocnemius was higher(P<0.01).After landing,the coactivation ratio of the muscles around the hip joint was higher in females with DKV than in normal females(P<0.01).In normal females,a strong negative correlation was observed between frontal-plane MoS and hip joint stiffness(r=-0.634,P=0.048).In females with DKV,strong negative correlations were found between frontalplane MoS and frontal-plane hip joint stiffness(r=-0.600,P=0.042)as well as between frontal-plane MoS and sagittal-plane ankle joint stiffness(r=-0.673,P=0.024).Conclusions During running,females with DKV exhibit reduced dynamic stability and insufficient frontal-plane knee/ankle joint stiffness,indicating a potential injury risk.To compensate for inadequate proximal joint control,females with DKV increase the activation of distal joint muscles prior to ground contact,which may help prevent further deterioration of dynamic stability and frontalplane knee/ankle joint stiffness.Females with DKV show a strong negative correlation between dynamic stability and joint stiffness during running.When the body experiences instability in the frontal plane,stability can be maintained by increasing sagittal-plane ankle stiffness and frontal-plane hip stiffness.
作者
王朋飞
邢泽宇
武梦旖
王冲
安鹏达
梁心旺
冯亮
霍洪峰
WANG Pengfei;XING Zeyu;WU Mengyi;WANG Chong;AN Pengda;LIANG Xinwang;FENG Liang;HUO Hongfeng(School of Physical Education,Hebei Normal University,Shijiazhuang 050024,China;Hebei University of Media and Communication,Shijiazhuang 051430,China;Hebei Provincial Key Laboratory of Human Sports Bioinformation Evaluation,Shijiazhuang 050024,China)
出处
《医用生物力学》
北大核心
2025年第6期1541-1548,1591,共9页
Journal of Medical Biomechanics
基金
河北省科技支撑项目(16275709)。
关键词
动态膝外翻
动态稳度
动态稳定性
关节刚度
跑步
dynamic knee valgus
margin of stability
dynamic stability
joint stiffness
running
