Thonnard J L, Bragard D, Willems P A, Plaghki L
Unité de Réadaptation, Université Catholique de Louvain, Brussels, Belgium.
Am J Sports Med. 1996 May-Jun;24(3):356-61. doi: 10.1177/036354659602400318.
We measured the bare ankle and the braced angle-torque relationships in 12 uninjured volunteers under static and dynamic conditions within the full range of inversion motion. These relationships were measured with a specially designed mechanical device that allowed inversion movements with angular velocities up to 850 deg/sec. In testing the bare ankle under static conditions, the torque showed a 10-fold increase within the full range of motion (average, from 0.9 N-m at 7 degrees to about 8 N-m at 48 degrees of inversion). The slope of the angle-torque relationship increased under dynamic conditions giving higher torque values (up to 18 N-m on average). Both orthoses induced similar additional torques that increased linearly, up to about 6 N-m at 45 degrees, with higher angles of inversion. These additional torques are small compared with the amount of stress applied to the foot during a typical ankle sprain situation, such as recovering from a jump. Therefore, we propose that orthotic devices increase the ankle torque, counteracting the inversion movement, and also prevent the start of the inversion movement by preloading and maintaining the ankle in a proper anatomic position with optimal contact between the articular surfaces.
我们在12名未受伤的志愿者中，于内翻运动的全范围内，在静态和动态条件下测量了裸踝和佩戴矫形器时的角度-扭矩关系。这些关系是使用一种专门设计的机械设备测量的，该设备允许以高达850度/秒的角速度进行内翻运动。在静态条件下测试裸踝时，扭矩在整个运动范围内增加了10倍（平均而言，从7度时的0.9牛米增加到48度内翻时的约8牛米）。在动态条件下，角度-扭矩关系的斜率增加，产生更高的扭矩值（平均高达18牛米）。两种矫形器都会产生类似的额外扭矩，这些扭矩呈线性增加，在45度时高达约6牛米，内翻角度越大扭矩越高。与典型踝关节扭伤情况（如从跳跃中恢复）时施加在足部的应力相比，这些额外扭矩较小。因此，我们提出，矫形装置会增加踝关节扭矩，抵消内翻运动，并且还通过预加载并将踝关节维持在适当的解剖位置，使关节面之间达到最佳接触，从而防止内翻运动的起始。
