Phansangiemjit Amonsiri, Kasemjiwat Kamolphatra, Patchanee Krit, Panninvong Yossapat, Sunisarud Ana, Choisunirachon Nan, Thanaboonnipat Chutimon
Faculty of Veterinary Science, Chulalongkorn University, Henri-Dunant Road, Pathumwan, Bangkok 10330, Thailand.
Department of Veterinary Surgery, Faculty of Veterinary Science, Chulalongkorn University, Henri-Dunant Road, Pathumwan, Bangkok 10330, Thailand.
Animals (Basel). 2024 Jan 31;14(3):470. doi: 10.3390/ani14030470.
The objective of this study was to elucidate the differences in vertebral length, vertebral height, and vertebral length/height ratio of the fourth thoracic vertebra (T4), the second lumbar vertebra (L2), the fifth lumbar vertebra (L5) and the seventh lumbar vertebra (L7) based on radiographs in dogs with various body sizes, skull types, and thoracic conformations and to determine the relationships of these parameters with age and sex. A total of 258 dogs were included in this study and classified by three criteria-BW (Criterion 1), skull type (Criterion 2), and thoracic conformation (Criterion 3). Age had weak negative correlations with vertebral length and height. Sex did not affect the vertebral size parameters. BW had strong positive correlations with vertebral length and height, but there was no influence of BW on vertebral length/height ratio. Regarding the different body sizes and conformations, large breeds had vertebrae with significantly greater length and height than small and medium breeds ( < 0.001). In Criterion 2, the vertebrae of the mesocephalic dogs had significantly greater length and height than those of the brachycephalic and dolichocephalic dogs ( < 0.05). In Criterion 3, both deep-chest and round-chest dogs had vertebrae with significantly greater length and height than the barrel-chest dogs ( < 0.0001). Only vertebral length/height ratios of T4 were not influenced by age, sex, BW, skull type, and thoracic conformation. Age, differences in body size, skull type, and thoracic conformation could affect the vertebral size in dogs. Therefore, using breed-specific vertebral lengths and/or heights is a better approach for comparative radiographic analysis with vertebral measurements.
本研究的目的是基于不同体型、头骨类型和胸廓形态的犬只的X线片，阐明第四胸椎（T4）、第二腰椎（L2）、第五腰椎（L5）和第七腰椎（L7）的椎体长度、椎体高度以及椎体长度/高度比的差异，并确定这些参数与年龄和性别的关系。本研究共纳入258只犬，并根据三个标准进行分类——体重（标准1）、头骨类型（标准2）和胸廓形态（标准3）。年龄与椎体长度和高度呈弱负相关。性别不影响椎体大小参数。体重与椎体长度和高度呈强正相关，但体重对椎体长度/高度比没有影响。关于不同的体型和形态，大型犬种的椎体长度和高度明显大于中小型犬种（<0.001）。在标准2中，中头型犬的椎体长度和高度明显大于短头型和长头型犬（<0.05）。在标准3中，深胸型和圆胸型犬的椎体长度和高度均明显大于桶胸型犬（<0.0001）。只有T4的椎体长度/高度比不受年龄、性别、体重、头骨类型和胸廓形态的影响。年龄、体型、头骨类型和胸廓形态的差异会影响犬的椎体大小。因此，使用特定品种的椎体长度和/或高度进行椎体测量的比较放射学分析是一种更好的方法。
