title: Relationship between axial radioulnar incongruence with cartilage damage in dogs with medial coronoid disease.
abstract: OBJECTIVE
  To quantify axial radioulnar incongruence (aRUI) in dogs with simple fragmented medial coronoid process (FCP) and those with advanced medial coronoid disease (MCD).
  
  
  METHODS
  Retrospective clinical study.
  
  
  METHODS
  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.
  
  
  CONCLUSIONS
  Axial RUI is greater and more prevalent in elbows with severe cartilage disease, and consists most commonly of a short radius.
authors: Department of Small Animal Medicine, University of Leipzig, Leipzig, Germany.
authors: Hamdi
authors: H
authors: Eljack
authors: Peter
authors: P
authors: Böttcher
mesh_terms: D000818:Animals; D001182:Arthroscopy / Q000662:veterinary*; D002356:Cartilage / Q000000981:diagnostic imaging / Q000293:injuries; D004283:Dog Diseases / Q000000981:diagnostic imaging / Q000601:surgery*; D004285:Dogs; D005260:Female; D005552:Forelimb / Q000000981:diagnostic imaging; D007592:Joint Diseases / Q000000981:diagnostic imaging / Q000662:veterinary*; D007794:Lameness, Animal; D008297:Male; D011884:Radius / Q000000981:diagnostic imaging; D012189:Retrospective Studies; D012720:Severity of Illness Index; D014057:Tomography, X-Ray Computed / Q000662:veterinary; D014457:Ulna / Q000000981:diagnostic imaging