Pourcelot P, Degueurce C, Audigié F, Denoix J M, Geiger D
Equipe Associée INRA Biomécanique du Cheval, Unité Pédagogique Anatomie des Mammifères Domestiques, Ecole Nationale Vétérinaire d'Alfort, Maisons-Alfort, France.
Equine Vet J Suppl. 1997 May(23):93-6. doi: 10.1111/j.2042-3306.1997.tb05063.x.
This study of the locomotion symmetry was undertaken to provide standard symmetry indices of a group of sound horses at the trot. Using a 3D data collection system, the kinematics of the limb joints of 13 clinically nonlame horses were recorded while trotting in the standard conditions of the clinical lameness examination. A kinematic symmetry indice based on an inter-correlation method was defined and applied to the vertical displacement-time and joint angle-time diagrams of the left and right joints of the horses. For each horse, the mean symmetry indice of each joint was calculated using values from 5 trials. For each joint, these means were then averaged. To evaluate the repeatability of the locomotion symmetry, the intra- and inter-individual variabilities of the symmetry indices were studied. The levels of symmetry of the markers of the trunk were generally lower than those of the limbs. Moreover, during the 5 trials these levels of symmetry were strongly variable but their mean values were very similar from one horse to another. In our experimental conditions the trunk presented a higher degree of freedom than the limbs. This high intra-individual variability indicated also that several trials are necessary to quantify the locomotion symmetry of a trotting horse. In the same way, a lower level of symmetry of the hindlimbs, compared to the forelimbs, was proved by their lower values of symmetry indices. As opposed to the supporting role of the forelimbs, the propulsive role of the hindlimbs may explain this feature.
本研究旨在对一组健康马匹在小跑时的运动对称性进行研究，以提供标准的对称性指标。使用三维数据采集系统，在临床跛行检查的标准条件下，记录了13匹临床无跛行马匹小跑时四肢关节的运动学数据。定义了一种基于相互关联方法的运动学对称性指标，并将其应用于马匹左右关节的垂直位移-时间图和关节角度-时间图。对于每匹马，使用5次试验的值计算每个关节的平均对称性指标。然后对每个关节的这些平均值进行平均。为了评估运动对称性的可重复性，研究了对称性指标的个体内和个体间变异性。躯干标记的对称性水平通常低于四肢。此外，在5次试验中，这些对称性水平变化很大，但它们的平均值在不同马匹之间非常相似。在我们的实验条件下，躯干比四肢具有更高的自由度。这种高个体内变异性还表明，需要进行多次试验才能量化小跑马匹的运动对称性。同样，后肢的对称性指标值较低，证明后肢的对称性水平低于前肢。与前肢的支撑作用相反，后肢的推进作用可能解释了这一特征。
