Bog spavin is caused by what in OCD of the tarsocrural joint?

Bog spavin is caused by what in OCD of the tarsocrural joint?

• A. Joint hemorrhage
• B. Soft tissue swelling
• C. Joint effusion
• D. Nerve involvement

Answer: (C)

Bog spavin is a distension of the tarsocrural joint caused by an excess of synovial fluid inside the joint capsule, i.e., joint effusion. In OCD of this joint, cartilage defects irritate the synovial lining and promote inflammation and increased synovial fluid production, leading to visible swelling over the hock. This intra-articular swelling distinguishes it from a hemorrhage (blood in the joint), soft tissue swelling (swelling of surrounding tissues outside the joint capsule), or nerve involvement (which would cause neurologic signs rather than joint distension).

Bog spavin is a distension of the tarsocrural joint caused by an excess of synovial fluid inside the joint capsule, i.e., joint effusion. In OCD of this joint, cartilage defects irritate the synovial lining and promote inflammation and increased synovial fluid production, leading to visible swelling over the hock. This intra-articular swelling distinguishes it from a hemorrhage (blood in the joint), soft tissue swelling (swelling of surrounding tissues outside the joint capsule), or nerve involvement (which would cause neurologic signs rather than joint distension).