In horses, which joint has a poor prognosis after surgical treatment of OCD?

In horses, which joint has a poor prognosis after surgical treatment of OCD?

• A. Stifle.
• B. Shoulder.
• C. Tarsal.
• D. Hip.

Answer: (B)

When thinking about prognosis after surgical treatment of OCD in horses, the ability to restore a smooth, congruent joint surface and slow or halt degenerative changes is the deciding factor. The shoulder tends to have a poorer outcome for several reasons. Surgically accessing the shoulder joint to remove an osteochondral fragment and to adequately debride the defect is technically challenging in a standing horse, so complete removal and smoothing of the lesion is often difficult. The lesions in the shoulder frequently involve the humeral head or glenoid with subchondral bone involvement, which makes durable repair less likely. The cartilage in this area has limited regenerative capacity, so even after fragment removal, the remaining defect can lead to persistent incongruity and rapid progression of osteoarthritis, causing lasting lameness. In contrast, other joints such as the stifle or tarsus generally offer easier access and more favorable healing dynamics, contributing to a better prognosis after OCD surgery.

When thinking about prognosis after surgical treatment of OCD in horses, the ability to restore a smooth, congruent joint surface and slow or halt degenerative changes is the deciding factor. The shoulder tends to have a poorer outcome for several reasons. Surgically accessing the shoulder joint to remove an osteochondral fragment and to adequately debride the defect is technically challenging in a standing horse, so complete removal and smoothing of the lesion is often difficult. The lesions in the shoulder frequently involve the humeral head or glenoid with subchondral bone involvement, which makes durable repair less likely. The cartilage in this area has limited regenerative capacity, so even after fragment removal, the remaining defect can lead to persistent incongruity and rapid progression of osteoarthritis, causing lasting lameness. In contrast, other joints such as the stifle or tarsus generally offer easier access and more favorable healing dynamics, contributing to a better prognosis after OCD surgery.