![]() The permanence of the examiner within the X-ray room to hold the animal leads inevitably to his exposition to ionizing radiation ( 8). Thousands of these types of radiographs are taken daily. The medical objective is to obtain a radiograph with symmetrical pelvis and parallel femurs and patella centered on the distal femoral metaphysis ( 8, 9). In this view, the dog is sedated or anesthetized and placed in dorsal recumbency on the X-ray table, and the examiner maintains the dog's hind limbs extended parallel to each other and the stifles internally rotated ( 8). The conventional ventrodorsal hip extended (VDHE) view is the most used worldwide ( 2– 4, 8, 9). The radiographic pelvic view must comply with positioning rules to obtain the adequate quality for medical radiographic analysis ( 1). Canine HD phenotype inherence is considered highly complex ( 7). Despite its determinant hereditary component, a genetic test that permits a reliable diagnosis does not yet exist, and it is based on the radiographic examination ( 3– 6). The recommended medical strategy to reduce HD's negative impact on canine populations is to select the better animals for breeding ( 3, 4). Hip dysplasia (HD) is an important hereditary orthopedic disease in the dog associated with osteoarthritis, resulting in an inadequate welfare for affected animals ( 1, 2). ![]() These results showed statistical reproducibility of NA measurements by the hind limb holder device, and the examiner was protected from exposure to ionizing radiation within the X-ray room. The mean ± standard deviation of NA was 101.1° ± 6.2° and 100.9° ± 6.1° in the manual and holder device hind limb restraining, respectively ( P > 0.05), and the lower limit of 95% confidence interval of intraclass correlation coefficient was >0.75. The holder device positioning showed a better pelvic symmetry ( P 0.05). The results showed a random distribution of right and left pelvic tilting, patella lateral or medial displacement, and hip subluxation categories in both samples ( P > 0.05). The variables studied were pelvic tilting, patella displacement index, Norberg angle (NA), and subluxation hip category. In this study, the technical quality of VDHE radiographs and hip measurements was compared in 65 dogs radiographed twice, one with the common veterinarian manual restraining and the other obtained using a hind limb holder device, without the veterinarian within the X-ray room. The veterinarian exposition to ionizing radiation is inevitable. This view normally is performed with manual restraining of the dog to obtain radiographs with acceptable technical quality. The radiographic ventrodorsal hip extended (VDHE) view is used worldwide to select the better animals for breeding. Hip dysplasia (HD) is an important hereditary orthopedic disease in the dog associated with osteoarthritis and inadequate welfare for affected animals. 4Department of Veterinary Science, University of Trás-os-Montes and Alto Douro, Vila Real, Portugal.3Department of Animal Science, University of Trás-os-Montes and Alto Douro, Vila Real, Portugal.2CITAB - Centre for the Research and Technology of Agro-Environmental and Biological Sciences, University of Trás-os-Montes and Alto Douro, Vila Real, Portugal.1Faculty of Veterinary Medicine, Lusófona University, Lisbon, Portugal.Ana Santana 1,2 Sofia Alves-Pimenta 2,3 João Martins 1,2 Bruno Colaço 2,3 Mário Ginja 2,4 *
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