Department of Corrective Exercise and Sports Injuries, Faculty of Physical Education and Sport Sciences, Allameh Tabataba'i University, Tehran, Iran.
Department of Mechanical Engineering, K. N. Toosi University of Technology, Tehran, Iran.
Sci Rep. 2021 Sep 1;11(1):17516. doi: 10.1038/s41598-021-96919-y.
Dynamic knee valgus (DKV) malalignment affects the biomechanical characteristic during sports activities. This cross-sectional study was conducted to evaluate mechanical energy absorption (MEA) strategies at initial contact (IC) and total landing (TL) phases during single-leg landing (SLL), and double-leg landing (DLL). Twenty-eight female athletes with DKV (age 10-14) were invited. MEA analysis of lower extremity joints was done in sagittal and frontal motion planes employing 8 Vicon motion capture cameras and 2 Kistler force plates. Statistical analysis was done using IBM Statistics (version24) by Bivariate Pearson Correlation Coefficient test. Knee extensors MEA during SLL (IC: P = 0.008, R = 0.522/TL: P < 0.001, R = 0.642) and DLL (IC: P < 0.001, R = 0.611/TL: P = 0.011, R = 0.525), and knee abductors during SLL (IC: P = 0.021, R = 0.474) were positively correlated with increased DKV angle. Ankle plantar flexors during SLL (TL: P = 0.017, R = - 0.477) and DLL (TL: P = 0.028, R = - 0.404), and hip extensors during SLL (TL: P = 0.006, R = - 0.5120) were negatively correlated with increased DKV angle. Compensated MEA in knee extensors was correlated with less ankle plantar flexion MEA during SLL (IC: P = 0.027, R = - 0.514/TL: P = 0.007, R = - 0.637) and DLL (IC: P = 0.033, R = - 00.412/TL: P = 0.025, R = - 0.485). These outcomes indicated a knee-reliant MEA strategy in female athletes with DKV during puberty, putting them at higher risks of ACL injuries during landing.
动态膝外翻（DKV）对线不良会影响运动活动中的生物力学特征。本横断面研究旨在评估单腿落地（SLL）和双腿落地（DLL）时初始接触（IC）和总着陆（TL）阶段的下肢关节的机械能吸收（MEA）策略。邀请了 28 名患有 DKV（10-14 岁）的女性运动员。在矢状面和额状面运动平面上使用 8 个 Vicon 运动捕捉摄像机和 2 个 Kistler 力板对下肢关节进行 MEA 分析。使用 IBM Statistics（版本 24）通过双变量 Pearson 相关系数检验进行统计分析。SLL 时膝关节伸肌的 MEA（IC：P=0.008，R=0.522/TL：P<0.001，R=0.642）和 DLL（IC：P<0.001，R=0.611/TL：P=0.011，R=0.525）以及 SLL 时膝关节外展肌（IC：P=0.021，R=0.474）与 DKV 角度增加呈正相关。SLL 时踝关节跖屈肌（TL：P=0.017，R=-0.477）和 DLL（TL：P=0.028，R=-0.404）以及 SLL 时髋关节伸肌（TL：P=0.006，R=-0.5120）与 DKV 角度增加呈负相关。SLL 时膝关节伸肌的代偿性 MEA 与踝关节跖屈肌的 MEA 减少呈负相关（IC：P=0.027，R=-0.514/TL：P=0.007，R=-0.637）和 DLL（IC：P=0.033，R=-00.412/TL：P=0.025，R=-0.485）。这些结果表明，青春期患有 DKV 的女性运动员存在依赖于膝关节的 MEA 策略，使她们在落地时更易受伤前交叉韧带（ACL）损伤。
