Podraza Jeffery T, White Scott C, Ramsey Dan K
Department of Physical Therapy, D'Youville College, Buffalo, NY, United States; Department of Exercise and Nutrition Sciences, University at Buffalo, Buffalo, NY, United States.
Department of Exercise and Nutrition Sciences, University at Buffalo, Buffalo, NY, United States.
Hum Mov Sci. 2018 Apr;58:155-164. doi: 10.1016/j.humov.2018.02.001. Epub 2018 Mar 12.
The principle of lower limb support, and the contribution of hip, knee and ankle moments to an overall limb support strategy for an impact-like, rapid deceleration movement may help explain individual moment magnitude changes, thereby providing insight into how injury might occur or be avoided. Twenty subjects performed single limb, impact-like, deceleration landings at three different knee flexion angles in the range of 0-25, 25-50 and 50-75°. Kinematic and kinetic measures identified hip, knee and ankle moment contribution to limb support moments (LSMs) in three planes. Repeated measures ANOVA compared LSMs and the contribution of individual joint moments at initial contact (IC) and 50 ms after. There were no significant differences in the overall LSMs at IC in any plane when the deeper knee flexion landings (25-50° and 50-75°) were compared to the 0-25° landing position but there were significant changes in the 50 ms period after IC. There were greater overall extensor LSMs, less resistance to medial opening of the knee and decreased support against internal tibia rotation when landing in greater knee flexion. The role of individual joint moments changed rapidly in the 50 ms period after initial landing; and, the relative contribution of the hip and ankle moments depended on the degree of limb flexion at landing. Analyses of individual joint moments emphasized the critical role that the hip joint moments have in balancing potentially injurious knee moments in all three planes for all three landing conditions.
下肢支撑原理，以及髋、膝和踝关节力矩对类似冲击的快速减速运动的整体肢体支撑策略的贡献，可能有助于解释个体力矩大小的变化，从而深入了解损伤可能如何发生或避免。20名受试者在0 - 25°、25 - 50°和50 - 75°范围内的三个不同膝关节屈曲角度下进行单腿类似冲击的减速着陆。运动学和动力学测量确定了髋、膝和踝关节力矩在三个平面上对肢体支撑力矩（LSMs）的贡献。重复测量方差分析比较了初始接触（IC）时和之后50毫秒时的LSMs以及各个关节力矩的贡献。当将较深膝关节屈曲着陆（25 - 50°和50 - 75°）与0 - 25°着陆位置进行比较时，在任何平面上IC时的整体LSMs均无显著差异，但在IC后50毫秒期间有显著变化。在更大膝关节屈曲着陆时，整体伸肌LSMs更大，对膝关节内侧张开的抵抗力更小，对内胫骨旋转的支撑减少。在初始着陆后的50毫秒内，各个关节力矩的作用迅速变化；而且，髋和踝关节力矩的相对贡献取决于着陆时肢体屈曲的程度。对各个关节力矩的分析强调了髋关节力矩在所有三种着陆条件下的所有三个平面中平衡潜在有害膝关节力矩方面的关键作用。
