Keegan K G, Pai P F, Wilson D A
Department of Veterinary Medicine and Surgery, College of Veterinary Medicine, University of Missouri, Columbia 65211, USA.
Biomed Sci Instrum. 2000;36:239-44.
Evaluation of the asymmetry of vertical head movement is used during kinematic evaluation of forelimb lameness in horses. For mild lameness, absolute translational measurements are not sensitive enough to detect small differences in the asymmetry of vertical head movement. Also, conscious movement of the head by the horse, not associated with lameness, interferes with accurate measurement. We describe an improved method of evaluating vertical head movement as a measure of lameness, using an model of induced lameness in 9 horses and a time-domain processing technique of curve-fitting. The technique assumes that vertical head movement can be broken down into 3 components; the natural inertially-driven vertical head movement, the alteration of vertical head movement caused by forelimb lameness, and extraneous head movement. The technique uses data from several contiguous strides, eliminates the natural inertially-driven and extraneous head movements, and quantifies lameness as a single value. The technique is shown to more sensitive to change in lameness than absolute measurement of head height translation and to be more accurate than a previously reported frequency-domain technique.
在马前肢跛行的运动学评估中，会对垂直头部运动的不对称性进行评估。对于轻度跛行，绝对平移测量不够灵敏，无法检测出垂直头部运动不对称性的微小差异。此外，马有意识地移动头部（与跛行无关）会干扰准确测量。我们描述了一种改进的评估垂直头部运动的方法，以此作为跛行的一种度量，该方法使用了9匹马的诱发跛行模型和曲线拟合的时域处理技术。该技术假定垂直头部运动可分解为3个分量：自然惯性驱动的垂直头部运动、由前肢跛行引起的垂直头部运动变化以及外部头部运动。该技术使用来自几个连续步幅的数据，消除自然惯性驱动和外部头部运动，并将跛行量化为一个单一值。结果表明，该技术对跛行变化比头部高度平移的绝对测量更敏感，并且比先前报道的频域技术更准确。
