Department for Companion Animals and Horses, University Clinic for Small Animals, Small Animal Surgery, University of Veterinary Medicine, Vienna, Austria.
Clinica Veterinaria Vezzoni, Cremona, Italy.
PLoS One. 2020 May 18;15(5):e0233257. doi: 10.1371/journal.pone.0233257. eCollection 2020.
This study aimed to verify if a significant difference exists between parameters in the early evaluation of normal and near-normal hip joints, to evaluate the influence of age and breed on the parameters, and to clarify the usefulness of a total score for differentiating between Fédération Cynologique Internationale (FCI) grade A and B hips.
A total of 231 dogs were classified according to whether they had FCI A or B hips at adulthood, with measurements obtained at 14-28 weeks of age. The total score was calculated by the summation of the following quantitative parameters: angle of subluxation (AS), angle of reduction (AR), laxity index (LI), and dorsal acetabular rim slope (DARS). Logistic regression analysis was performed to establish the probability of the study population to develop an FCI B hip based on the total score. This was repeated for the highest score in combination with the worst-rated hip and once more for breeds.
No correlation between age and the parameters was found in the cohort, or for FCI A and B. The values of all the parameters were significantly lower in the FCI A group than in the FCI B group (AR: 4.42° ± 6.0° vs 7.62° ± 7.2°; AS: 0.45° ± 1.9° vs 1.55° ± 3.8°; LI: 0.32 ± 0.1 vs 0.36 ± 0.1; DARS: 3.30° ± 1.8° vs 3.77° ± 1.9°; TS: 11.47 ± 8.3 vs 16.65 ± 10.9). Labrador Retrievers and Golden Retrievers showed significant differences between parameters for both FCI grades. The range, where FCI A and B hips can be predicted on the basis of the total score, was different when assessed for the entire cohort, Labrador Retrievers, and Golden Retrievers.
Our results show that even in normal and near-normal hips, the parameters significantly differed in the early evaluation. Moreover, cutoff values should be set for different breeds in the prediction of the FCI grade during early evaluation for a better breeding selection regarding canine hip dysplasia, one of the most common orthopedic diseases among large and giant breed dogs.
本研究旨在验证正常和接近正常髋关节的早期评估参数之间是否存在显著差异，评估年龄和品种对参数的影响，并阐明总分在区分国际犬业联合会（FCI）A级和 B 级髋关节方面的有用性。
总共对 231 只狗进行分类，依据其成年后是否为 FCI A 或 B 髋关节，在 14-28 周龄时获得测量值。总分通过以下定量参数的总和计算：半脱位角（AS）、还原角（AR）、松弛指数（LI）和背侧髋臼缘斜率（DARS）。使用逻辑回归分析，根据总分建立研究人群发展为 FCI B 髋关节的概率。对最高评分与最差评级髋关节的组合以及对品种进行了重复分析。
在队列中或在 FCI A 和 B 中均未发现年龄与参数之间存在相关性。FCI A 组的所有参数值均显著低于 FCI B 组（AR：4.42°±6.0° vs 7.62°±7.2°；AS：0.45°±1.9° vs 1.55°±3.8°；LI：0.32±0.1 vs 0.36±0.1；DARS：3.30°±1.8° vs 3.77°±1.9°；TS：11.47±8.3 vs 16.65±10.9）。拉布拉多猎犬和金毛猎犬在两种 FCI 分级的参数之间显示出显著差异。在整个队列、拉布拉多猎犬和金毛猎犬中，基于总分预测 FCI A 和 B 髋关节的范围不同。
我们的研究结果表明，即使在正常和接近正常的髋关节中，早期评估参数也存在显著差异。此外，在早期评估中，为了更好地选择犬髋关节发育不良的繁殖，针对不同品种，应该为预测 FCI 分级设定临界值，犬髋关节发育不良是大型和巨型犬中最常见的骨科疾病之一。
