How does the outcome of surgical intervention for OCD differ between dogs and horses?

How does the outcome of surgical intervention for OCD differ between dogs and horses?

• A. Dogs have a good prognosis for shoulder OCD but a guarded prognosis for stifle or tarsal OCD, whereas horses have a better prognosis for stifle or tarsal OCD but poor prognosis for shoulder OCD.
• B. Dogs have a poor prognosis for shoulder OCD; horses uniformly good.
• C. Dogs and horses both have excellent prognosis for shoulder OCD; prognosis for other joints is poor in both.
• D. Dogs have a better prognosis for all joints; horses have poor prognosis for all joints.

Answer: (A)

The key idea is that prognosis after OCD surgery varies by species and by joint. In dogs, surgery for shoulder OCD tends to have a favorable outcome, while involvement of the stifle or tarsus carries a more guarded prognosis because those joints are biomechanically complex and lesions there may be more challenging to heal so that function is not as reliably restored. In horses, the opposite pattern is often seen: the shoulder is harder to treat and carries a poorer prognosis, whereas lesions in the stifle or tarsus commonly respond better to surgical management, with a reasonable chance of returning to function. This is exactly what choice A conveys: dogs good for shoulder OCD but guarded for stifle or tarsal, and horses better for stifle or tarsal but poor for shoulder. Other options imply uniform outcomes across joints or across species, which doesn’t align with these observed differences.

The key idea is that prognosis after OCD surgery varies by species and by joint. In dogs, surgery for shoulder OCD tends to have a favorable outcome, while involvement of the stifle or tarsus carries a more guarded prognosis because those joints are biomechanically complex and lesions there may be more challenging to heal so that function is not as reliably restored. In horses, the opposite pattern is often seen: the shoulder is harder to treat and carries a poorer prognosis, whereas lesions in the stifle or tarsus commonly respond better to surgical management, with a reasonable chance of returning to function. This is exactly what choice A conveys: dogs good for shoulder OCD but guarded for stifle or tarsal, and horses better for stifle or tarsal but poor for shoulder. Other options imply uniform outcomes across joints or across species, which doesn’t align with these observed differences.