Which condition is described by fissure formation between thickened cartilage and subchondral bone, possible joint mouse, typically in young dogs, with the glenohumeral joint most often affected?

Which condition is described by fissure formation between thickened cartilage and subchondral bone, possible joint mouse, typically in young dogs, with the glenohumeral joint most often affected?

• A. Osteochondrosis
• B. Elbow Dysplasia
• C. Osteochondrosis Dissecans
• D. Bicepital Tendinitis

Answer: (B)

The key idea here is a disruption in how articular cartilage and the underlying bone mature, leading to a problematic piece of cartilage and possibly a loose fragment in the joint. In young dogs, osteochondrosis can cause thickened, poorly formed cartilage that fissures away from the subchondral bone. When a flap of cartilage and affected bone detaches, a joint mouse (loose osteochondral fragment) can form. This pattern is classic for osteochondrosis dissecans, and the shoulder (glenohumeral joint) is a common site. Elbow dysplasia involves developmental problems in the elbow joint itself and usually presents with different elbow-specific abnormalities (such as fragments of the medial coronoid process or an ununited anconeal process), not the fissuring and potential detachment of cartilage seen in OCD of the shoulder. Biceps tendinitis is a soft-tissue issue involving the biceps tendon, not a cartilage-bone joint lesion. So the described fissure with a possible joint fragment in a young dog’s shoulder best fits osteochondrosis dissecans in the glenohumeral joint.

The key idea here is a disruption in how articular cartilage and the underlying bone mature, leading to a problematic piece of cartilage and possibly a loose fragment in the joint. In young dogs, osteochondrosis can cause thickened, poorly formed cartilage that fissures away from the subchondral bone. When a flap of cartilage and affected bone detaches, a joint mouse (loose osteochondral fragment) can form. This pattern is classic for osteochondrosis dissecans, and the shoulder (glenohumeral joint) is a common site.

Elbow dysplasia involves developmental problems in the elbow joint itself and usually presents with different elbow-specific abnormalities (such as fragments of the medial coronoid process or an ununited anconeal process), not the fissuring and potential detachment of cartilage seen in OCD of the shoulder. Biceps tendinitis is a soft-tissue issue involving the biceps tendon, not a cartilage-bone joint lesion. So the described fissure with a possible joint fragment in a young dog’s shoulder best fits osteochondrosis dissecans in the glenohumeral joint.