Assessment of Elbow Joint Incongruity as a Primary Cause of Canine Elbow Dysplasia: Comparative Imaging Analysis Using CT and Radiography in 108 Dogs—A Retrospective Study

Based on the conducted studies, the following reference values were determined: for the height of the radioulnar "step" measured on radiographs, 0.3-1.5 mm; for the height of the radioulnar "step" measured in the CT examination, 0-1.5 mm; for the width of the joint space of the humeroulnar joint measured on MPR images in the sagittal section, 0.8-2.2 mm; and, for the width of the joint space of the humeroradial joint measured on MPR images in the sagittal section, 0.7-2.5 mm. An elbow incongruity was the most frequently diagnosed primary cause of elbow dysplasia, most often occurring in combination with other causes, particularly medial coronoid process disease.