Department of Small Animal Surgery and Radiology, Faculty of Veterinary Medicine, Cairo University, Giza, Egypt.
Diagnostic Imaging, Department of Molecular Biomedical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, NC.
Am J Vet Res. 2023 Feb 7;84(3). doi: 10.2460/ajvr.22.09.0165. Print 2023 Mar 1.
To develop quantitative measures that, when combined with the Fédération Cynologique Internationale (FCI) score, would potentially enhance the accuracy of the scoring process.
153 client-owned purebred German Shepherd Dogs with normal and near normal (71 dogs) and dysplastic coxofemoral joint (82 dogs).
Center edge (CE) angle, Norberg angle (NA), indexes of dorsal acetabular femoral head (AFH) coverage width and area, acetabular index angle, and inclination angle were determined. We also investigated the correlation between selected variables. Coxofemoral joints were classified into normal, near normal, and mildly, moderately, and severely dysplastic joints based on the morphometric criteria previously established by the conventional FCI scoring. Variables were compared among the 5 groups using ANOVA. Linear relationships were determined using Spearman correlation coefficients.
All radiographic measurements differed significantly (P < .0001) among the 5 assigned groups (normal, near normal, mildly dysplastic, moderately dysplastic, and severely dysplastic hip joints). NA was the only measure that differed significantly (P ≤ .03) between the 5 assigned groups. Positive correlations were identified between Norberg and CE angles (rs = 0.93), between width and area indexes of dorsal AFH coverage (rs = 0.92), and between the measurement techniques utilized to assess lateral versus dorsal AFH coverage (rs ≥ 0.65).
Evaluation of lateral and dorsal AFH coverage may help to refine the scoring system used to select German Shepherd Dogs for breeding. German Shepherd Dogs with NA < 103°, CE angle < 20.8°, dorsal AFH coverage width index ≤ 49%, and/or dorsal AFH coverage area index ≤ 51% should be considered to have mild, moderate, or severe hip dysplasia and are therefore not good candidates for breeding. Borderline values between near normal and mildly dysplastic joints should be reevaluated.
开发定量指标，与国际犬业联合会（FCI）评分相结合，提高评分过程的准确性。
153 只正常和接近正常（71 只）及发育不良髋关节（82 只）的纯种德国牧羊犬犬。
确定中心边缘（CE）角、Norberg 角（NA）、背侧髋臼股骨头（AFH）覆盖宽度和面积指数、髋臼指数角和倾斜角。我们还研究了选定变量之间的相关性。根据之前由常规 FCI 评分建立的形态计量学标准，将髋关节分为正常、接近正常、轻度、中度和重度发育不良关节。使用方差分析比较 5 组间变量的差异。使用 Spearman 相关系数确定线性关系。
在 5 个分配组（正常、接近正常、轻度发育不良、中度发育不良和重度发育不良髋关节）中，所有影像学测量值均有显著差异（P<0.0001）。Norberg 角是唯一在 5 个分配组之间有显著差异的指标（P≤0.03）。Norberg 和 CE 角之间存在正相关（rs=0.93），背侧 AFH 覆盖宽度和面积指数之间存在正相关（rs=0.92），评估侧向和背侧 AFH 覆盖的测量技术之间存在正相关（rs≥0.65）。
评估侧向和背侧 AFH 覆盖范围可能有助于完善用于选择德国牧羊犬犬进行繁殖的评分系统。具有 NA<103°、CE 角<20.8°、背侧 AFH 覆盖宽度指数≤49%和/或背侧 AFH 覆盖面积指数≤51%的德国牧羊犬犬应被视为具有轻度、中度或重度髋关节发育不良，因此不适合繁殖。接近正常和轻度发育不良关节之间的边界值应重新评估。
