Craniocaudal (a) and mediolateral (b) radiographs of the left elbow of dog 2 obtained preoperatively. A sagittally oriented, irregular fracture was seen extending from the caudoproximal aspect of the olecranon cranially through the caudal articular margin of the ulnar trochlear notch. This resulted in displacement of a proximal ulnar segment that included the olecranon and anconeal process. Note the fusiform osseous fragment associated with the lateral humeral epicondyle, best seen on the craniocaudal view. There is a small osteophyte located on the medial coronoid process consistent with mild preexisting osteoarthritis.