Department of Mechanical Engineering, Sogang University, Seoul, Republic of Korea.
Department of Mechanical Engineering, Sogang University, Seoul, Republic of Korea.
Gait Posture. 2021 Jan;83:127-131. doi: 10.1016/j.gaitpost.2020.08.130. Epub 2020 Aug 29.
Increasing the ankle plantar-flexion angle at initial contact (IC) during landing reduces the impact features associated with landing, such as the vertical ground reaction force and loading rate, potentially affecting the risk of anterior cruciate ligament (ACL) injury. However, the relationships between the ankle plantar-flexion angle at IC and the previously identified biomechanical factors related to noncontact ACL injury have not been studied.
Thus, the purpose of this study was to determine whether significant relationships exist between the ankle plantar-flexion angle at IC and the biomechanical factors related to noncontact ACL injury.
The peak anterior tibial shear force, peak external knee valgus moment, peak knee valgus angle, and combined peak external knee valgus plus tibial internal rotation moments were measured in 26 individuals while performing self-selected, single-leg landing. Pearson correlation analyses were performed to assess the relationships between the ankle plantar-flexion angle at IC and the biomechanical factors mentioned above.
The greater ankle plantar-flexion angle at IC was related to smaller the peak knee valgus moment (r = -0.5, p = 0.009) and the combined peak knee valgus plus internal rotation moments (r = -0.58, p = 0.001).
These results suggest that large ankle plantar-flexion angle at IC might be associated with lesser loading of the knee frontal plane and altering the self-selective ankle angle may result in biomechanical changes associated with ACL injury risk.
在落地时增加初始接触（IC）时的踝关节跖屈角度可以减少与落地相关的冲击特征，例如垂直地面反作用力和加载率，从而可能降低前交叉韧带（ACL）损伤的风险。然而，IC 时的踝关节跖屈角度与先前确定的与非接触性 ACL 损伤相关的生物力学因素之间的关系尚未得到研究。
因此，本研究的目的是确定 IC 时的踝关节跖屈角度与与非接触性 ACL 损伤相关的生物力学因素之间是否存在显著关系。
在 26 名个体进行自我选择的单腿落地时，测量了峰值胫骨前向剪切力、峰值膝关节外翻力矩、峰值膝关节外翻角度以及组合的膝关节外翻加胫骨内旋力矩。进行 Pearson 相关分析，以评估 IC 时的踝关节跖屈角度与上述生物力学因素之间的关系。
IC 时较大的踝关节跖屈角度与较小的峰值膝关节外翻力矩（r=-0.5，p=0.009）和组合的峰值膝关节外翻加内旋力矩（r=-0.58，p=0.001）相关。
这些结果表明，较大的 IC 时踝关节跖屈角度可能与膝关节额状面的较小载荷有关，并且改变自我选择的踝关节角度可能导致与 ACL 损伤风险相关的生物力学变化。
