Gait Laboratory, Central Remedial Clinic, Clontarf, Dublin 3, Ireland.
Gait Laboratory, Central Remedial Clinic, Clontarf, Dublin 3, Ireland.
Gait Posture. 2020 Oct;82:96-99. doi: 10.1016/j.gaitpost.2020.08.127. Epub 2020 Aug 30.
Centre of pressure (CoP) location error is common when predicting inverse dynamic parameters during gait. Tolerance levels of error have been previously reported. However, the clinical impact of gait velocity on CoP error has not been considered.
What is the clinical impact of CoP error with increasing gait velocity on predicted inverse dynamic parameters during gait in children with typical development?
Three-dimensional kinematic and kinetic data were recorded at three self-selected velocities on children with typical development (walking, fast instructed walking and running). CoP location error was applied in 3 mm increments up to a maximum of 12 mm in an anteroposterior direction. Differences in maximum kinetic parameters between increments and gait velocities were assessed in conjunction with changes in GDI-kinetic.
Relative error (difference expressed as a % of maximum moment) decreased at all joints as gait velocity increased. The GDI-kinetic was only clinically significant for the self-selected walking condition at 9 mm and 12 mm respectively.
The GDI-kinetic difference remained below the threshold for fast walking and running which suggested that CoP error of up to 12 mm in the 3D optoelectric / force plate configuration would be acceptable if subjects were assessed under these conditions.
在预测步态中的逆动力学参数时，中心压力（CoP）位置的误差很常见。之前已经报道了误差的容忍水平。然而，步态速度对 CoP 误差的临床影响尚未被考虑。
在典型发育的儿童中，随着步态速度的增加，CoP 误差对预测步态中的逆动力学参数有什么临床影响？
在三个自我选择的速度下，对典型发育的儿童进行三维运动学和动力学数据的记录（步行、快速指令步行和跑步）。CoP 位置误差以 3 毫米的增量递增，最大可达 12 毫米的前后方向。评估了各增量和步态速度之间的最大动力学参数差异，以及 GDI-kinetic 的变化。
随着步态速度的增加，所有关节的相对误差（差异以最大力矩的百分比表示）均降低。只有在自我选择的步行条件下，GDI-kinetic 在 9 毫米和 12 毫米时分别具有临床意义。
如果在这些条件下评估受试者，那么在 3D 光电/力板配置中 CoP 误差达到 12 毫米仍将是可接受的，因为 GDI-kinetic 的差异仍低于快速步行和跑步的阈值。
