Case Study

CT – Bilateral medial coronoid disease with elbow joint incongruity and osteoarthritis in a Golden Retriever

This Golden Retriever presented with left forelimb lameness. Rads suggest osteoarthritis possibly due to occult fragmented medial coronoid process

DX

Bilateral medial coronoid disease with large isolated fragments, mild complex elbow joint incongruity and mild to moderate secondary osteoarthritis • There is indirect evidence of cartilage breakdown with a kissing lesion of the medial humeral condyle. However, an actual subchondral bone defect is not seen.

Image Interpretation

CT of the elbows and shoulders –

Elbows: Both medial coronoid processes present a large isolated bone fragment of approximately 6 mm side length. The base of the medial coronoid processes reveals increased bone sclerosis. Moderate narrowing and incongruity of the radioulnar incisure is noted. A mild radioulnar step formation with a long ulna is seen bilaterally. The humeroulnar joint spaces are mildly asymmetric. The subchondral bone of the medial humeral condyle presents focal sclerosis opposed to the fragments resepctively. A moderate amount of osteophytes is seen at the periarticular margins of the left and right elbow joint.

Shoulders: Both shoulder joints present within normal limits