Quinn T P, Mote C D, Skinner H B
Department of Mechanical Engineering, University of California, Berkeley, 94720.
J Biomech. 1991;24(7):511-25. doi: 10.1016/0021-9290(91)90285-u.
The in vivo torsional laxity and stiffness of the knee joint are usually determined by rotating the foot and measuring the torque generated at the knee. However, when rotation is applied to the foot, significant three-dimensional forces and moments are produced at the knee. These forces and moments depend upon the external constraint of the ankle complex, and as a result, the observed laxity of the knee also depends on the ankle constraint. Tests are conducted with the foot of a subject in a shoe, with and without the ankle taped, and in a buckled and unbuckled (ski) boot that can effectively constrain ankle rotation. The average laxity of the primary (linear) region of the axial moment vs internal-external rotation is 30% greater when the ankle is constrained by the buckled boot than it is in three other cases of lesser ankle constraint.
膝关节的体内扭转松弛度和刚度通常通过转动足部并测量膝关节产生的扭矩来确定。然而，当对足部施加旋转时，膝关节会产生显著的三维力和力矩。这些力和力矩取决于踝关节复合体的外部约束，因此，观察到的膝关节松弛度也取决于踝关节的约束。测试在受试者穿着鞋子的情况下进行，分别在脚踝有和没有贴扎的情况下，以及在能有效限制踝关节旋转的扣合和未扣合（滑雪）靴中进行。当踝关节受到扣合靴的约束时，轴向力矩与内外旋转的主要（线性）区域的平均松弛度比踝关节约束较小的其他三种情况大30%。
