For this reason, the aim of this study was to set a number of lCOP pathways –derived data that could serve to detect lameness in dogs with unilateral ED. The hypothesis of this study was to prove that certain lCOP path characteristics are different in lame and sound limbs in dogs at walk and while standing still. Over time, ED causes joint damage, pain, and lameness. Regarding ED, this is a complex syndrome, where different factors could lead to a growth incongruence between the radius and ulna. In dogs, bCOP modifications in unilaterally lame animals with elbow dysplasia (ED) have also been reported. In the veterinary field, previously published studies only examine the bCOP path more recently, the bCOP path’s efficacy for the detection of lameness in ponies at walk has been settled.
This parameter is named statokinesiogram, and its value shows body or limb balance. The COP path can be also obtained in a standing position and records its resultant area during a determinate period of time. The main lCOP pathway characteristics that have been reported as useful are: 1) craniocaudal COP excursion (measured as an initial and final COP relative coordinates) 2) lateromedial displacement of the lCOP by means of the center of pressure excursion index (CPEI), which represents the lCOP path lateromedial excursion relative to limb width and multiplied by 100 to obtain this data in terms of percentage. In this sense, it has been able to reliably detect biomechanical modifications due to neurological deficits, such as Parkinson’s, Hemiparesis or even pain, in humans. The lCOP path characteristics obtained in moving subjects provide insights into foot dynamics during the support phase of gait in human and, potentially, in animal species. This parameter quantifies the dynamic load distribution under the foot. The COP position over time is named the COP path. These data should ultimately serve to detect lameness, and, among them, the center of pressure (COP) position may be considered the net output variable of interaction between all of the forces and torques that occur in the body (bCOP) or limb (lCOP) and its inertial properties. This invariably requires the use of more sophisticated systems. These methodologies should be able to provide accurate and reliable data and, if possible, form a set of parameters that will allow for the normal/abnormal static/dynamic events from a wide perspective. Various methods to analyze the locomotor status within the veterinary field have been developed in order to generate useful parameters from both kinematic and/or kinetic perspectives. This methodology based in limb COP characteristics serves to discriminate between sound and lame limbs in dogs with elbow dysplasia. Finally, the area of statokinesiograms was greater in lame limbs. In addition, the value of the COP excursion index was lower in lame limbs. The statistical analysis clearly showed that COP in lame limbs start cranially and were shorter than sound limbs. Sound and lame limb statokinesiograms were also obtained while the animals stood still. To compare variables, force platform data (peak vertical force and vertical impulse) from the same animals were obtained. Next, the COP path, in relation to the position of sound and lame limbs, was measured in a coordinate system over a standard paw template obtained by pedobarography during the whole support phase. To accomplish this purpose, ten unilaterally lame dogs of similar conformation were walked over a pressure platform.
Under this premise, the aim of this study was to test whether data derived from this parameter could detect the differences between sound and lame limbs in unilaterally lame dogs with elbow dysplasia. The limb center of pressure (COP) path measures and quantifies the load distribution within a limb in a still or moving subject.
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