Taroni Mathieu, Genevois Jean-Pierre, Viguier Eric, Pillard Paul, Livet Véronique, Cachon Thibaut, Carozzo Claude
Department of Small Animal Surgery, Campus Vétérinaire de Lyon, Marcy L'Etoile, France.
Unite ICE UPSP 2011-03-101, VetArgo Sup, Campus Vétérinaire de Lyon, Marcy-l'étoile, France.
Vet Comp Orthop Traumatol. 2018 Nov;31(6):445-451. doi: 10.1055/s-0038-1668087. Epub 2018 Oct 9.
The main purpose of this article is to evaluate the correlation between the distraction index (DI) and Norberg angle values in distracted hips (distraction Norberg angle, DNA) at 4 months of age and the official hip score based on the Fédération Cynologique Internationale (FCI) grid at 12 months of age.
For dogs ( = 215) from two guide dog training organizations, the DI and DNA were measured by a single expert on distraction radiographs performed at 4 months of age. The FCI score was determined by the same expert at 12 months of age on a standard hip-extended view.Statistical analysis included receiver operating characteristic curve analysis and concordance correlation coefficient calculation.
The mean DI was 0.48, the mean DNA was 86.5° and 59.5% of hips had an A FCI score. The concordance correlation coefficient of DI and DNA was 0.78. The DI threshold for D- and E-scored hips that was associated with the least misclassification was 0.58 (sensitivity [Se] = 0.6, specificity [Sp] = 0.82). The DNA threshold that was associated with the least misclassification was 85° (Se = 0.83, Sp = 0.68).
DNA has a fair correlation with DI at 4 months and reflects hip passive laxity. D and E FCI scores at 12 months cannot be reliably predicted from the 4 months value of DI or DNA but 96% of hips with DI < 0.58 at 4 months had an A, B or C FCI score at 12 months of age. Similarly, 98% of hips with DNA > 85° at 4 months had an A, B or C FCI score at 12 months of age.
本文的主要目的是评估4月龄时髋关节牵张指数（DI）与牵张髋关节的诺伯格角值（牵张诺伯格角，DNA）之间的相关性，以及12月龄时基于国际犬业联合会（FCI）标准的官方髋关节评分。
对来自两个导盲犬训练机构的215只犬，由一名专家在4月龄时对牵张X线片测量DI和DNA。同一名专家在12月龄时根据标准髋关节伸展位片确定FCI评分。统计分析包括受试者工作特征曲线分析和一致性相关系数计算。
平均DI为0.48，平均DNA为86.5°，59.5%的髋关节FCI评分为A。DI与DNA的一致性相关系数为0.78。与最少错误分类相关的D级和E级评分髋关节的DI阈值为0.58（敏感度[Se]=0.6，特异度[Sp]=0.82）。与最少错误分类相关的DNA阈值为85°（Se=0.83，Sp=0.68）。
4月龄时DNA与DI有一定相关性，反映髋关节被动松弛度。12月龄时的D级和E级FCI评分不能根据4月龄时的DI或DNA值可靠预测，但4月龄时DI<0.58的髋关节中，96%在12月龄时FCI评分为A、B或C。同样，4月龄时DNA>85°的髋关节中，98%在12月龄时FCI评分为A、B或C。
