Relationship Between Axial Radioulnar Incongruence With Cartilage Damage in Dogs With Medial Coronoid Disease

• Published in: Veterinary surgery Vol. 44; no. 2; pp. 174 - 179
• Main Authors: Eljack, Hamdi, Böttcher, Peter
• Format: Journal Article
• Language: English
• Published: United States Blackwell Publishing Ltd 01.02.2015
• Subjects: Animal diseases; Animals; Arthroscopy - veterinary; Cartilage; Cartilage - diagnostic imaging; Cartilage - injuries; Dog Diseases - diagnostic imaging; Dog Diseases - surgery; Dogs; Female; Forelimb - diagnostic imaging; Joint Diseases - diagnostic imaging; Joint Diseases - veterinary; Lameness, Animal; Male; Radius - diagnostic imaging; Retrospective Studies; Severity of Illness Index; Surgical outcomes; Tomography, X-Ray Computed - veterinary; Ulna - diagnostic imaging; Veterinary medicine
• ISSN: 0161-3499; 1532-950X
• DOI: 10.1111/j.1532-950X.2014.12234.x

Objective To quantify axial radioulnar incongruence (aRUI) in dogs with simple fragmented medial coronoid process (FCP) and those with advanced medial coronoid disease (MCD). Study Design Retrospective clinical study. Sample Population Group 1: 54 elbow joints (54 dogs) with FCP, but no other visible cartilage damage. Group 2: 32 elbows (32 dogs) with Outerbridge grade 3–4 cartilage pathology of the medial coronoid ± FCP. Methods aRUI was quantified using CT based 3D models of the radioulnar joint cup. A sphere was fitted to the trochlear notch of each of the 3D models and aRUI estimated in millimeters based on the relation of the sphere and the radial joint surface. Coronoid disease was diagnosed, classified, and graded using arthroscopy. Results Mean (±SD) aRUI for group 1 (0.2 ± 0.8 mm) was significantly less than in group 2 (0.8 ± 0.9 mm; P = .001). Overall, 14% had negative aRUI whereas 40% were congruent. Stepwise logistic regression analysis identified age and aRUI, but not body weight as significant covariates. The corresponding odds ratios for advanced MCD were 1.6 for age and 6.4 for RUI, respectively. Conclusion Axial RUI is greater and more prevalent in elbows with severe cartilage disease, and consists most commonly of a short radius.