To describe the computed tomography (CT) findings in dogs with severe elbow incongruity combined with a fragmented medial coronoid process (FCP) and compare these with normal joints and congruent joints affected by FCP.
Client-owned dogs with elbow lameness (n = 40) and purpose bred dogs (n = 5; controls).
The CT features of 32 severely incongruent joints with concomitant FCP were compared with those of 32 congruent elbow joints affected with FCP and 10 normal joints.
In severely incongruent elbow joints, a radioulnar step and widened joint spaces were visible on each CT plane. Additional features typically seen in severely incongruent elbows were a cyst at the radioulnar transition and fragmentation of the axial border of the medial coronoid incisure. None of these features appeared in normal or in congruent FCP joints.
On CT, several features associated with severe elbow incongruity and concomitant FCP were detected, which were not found in normal joints or congruent joints affected by FCP.