Which statement about OCD lesions in dogs is most accurate?

Which statement about OCD lesions in dogs is most accurate?

• A. They are most commonly located in the hip joint.
• B. They are most commonly located in the carpal joint.
• C. They are most commonly located in the stifle joint.
• D. They are most commonly located in the scapulohumeral joint.

Answer: (D)

OCD lesions in dogs most often affect the shoulder joint (scapulohumeral joint). The shoulder bears substantial load during growth and exercise, and the developing articular cartilage in the humeral head is particularly susceptible to abnormal endochondral ossification. When this process goes awry, cartilage and underlying subchondral bone can fissure and loosen, forming an osteochondral flap that causes pain and lameness. While OCD can occur in other joints such as the hip, elbow (stifle region), or carpus, those sites are less commonly involved than the shoulder in dogs.

OCD lesions in dogs most often affect the shoulder joint (scapulohumeral joint). The shoulder bears substantial load during growth and exercise, and the developing articular cartilage in the humeral head is particularly susceptible to abnormal endochondral ossification. When this process goes awry, cartilage and underlying subchondral bone can fissure and loosen, forming an osteochondral flap that causes pain and lameness. While OCD can occur in other joints such as the hip, elbow (stifle region), or carpus, those sites are less commonly involved than the shoulder in dogs.