van der Laan Luzanne, Kirberger Robert M, Fosgate Geoffrey T, Roux Christelle Le
Department of Companion Animal Clinical Studies, Faculty of Veterinary Science, University of Pretoria, Onderstepoort, South Africa.
Department of Production Animal Studies, Faculty of Veterinary Science, University of Pretoria, Onderstepoort, South Africa.
Vet Radiol Ultrasound. 2025 Nov;66(6):e70092. doi: 10.1111/vru.70092.
Medial coronoid process disease (MCPD) is the most frequently observed cause of elbow dysplasia, resulting in lameness in young, fast-growing large-breed dogs, including Labrador Retrievers (LRs). Computed tomography (CT) is the diagnostic imaging modality of choice for evaluating the medial coronoid process (MCP), as it is noninvasive and eliminates superimposition of the process by the radial head. This retrospective descriptive study aimed to describe the shape of the normal MCP on CT, to assess its variability within the LR breed, and to determine the normal Hounsfield units (HUs) of the MCP, medial radial head (MRH), and lateral radial head (LRH). Normal elbow CT studies of 51 South African guide dog LRs were reviewed. Using a repeatable imaging alignment technique, three principal MCP shapes were identified: ovoid, triangular, and softly pointed and were found to be dependent on the level of assessment. Males had significantly lower mean MCP HU compared to females. The mean HU of the MRH was consistently higher than the LRH and was also greater in attenuation on subjective assessment. Measuring MCP and radial head HU too proximally was suboptimal, as volume averaging was frequently encountered. The results of this study showed that although different alignment techniques may result in HU variations, they will not affect the HU to such an extent that the MCP would be misclassified as abnormal.
内侧冠状突疾病（MCPD）是最常见的肘部发育异常原因，会导致包括拉布拉多寻回犬（LRs）在内的年轻、快速生长的大型犬跛行。计算机断层扫描（CT）是评估内侧冠状突（MCP）的首选诊断成像方式，因为它是非侵入性的，且能消除桡骨头对该结构的重叠影像。这项回顾性描述性研究旨在描述CT上正常MCP的形态，评估其在LR品种内的变异性，并确定MCP、内侧桡骨头（MRH）和外侧桡骨头（LRH）的正常亨氏单位（HUs）。回顾了51只南非导盲犬LR的正常肘部CT研究。使用一种可重复的成像对齐技术，确定了三种主要的MCP形态：椭圆形、三角形和钝尖形，且发现其取决于评估水平。雄性犬的平均MCP HU显著低于雌性。MRH的平均HU始终高于LRH，并且在主观评估中其衰减程度也更大。在过于靠近近端测量MCP和桡骨头HU并不理想，因为经常会遇到容积平均效应。这项研究的结果表明，尽管不同的对齐技术可能会导致HU变化，但它们不会对HU产生如此大的影响以至于将MCP误分类为异常。
