Navicular disease is a differential diagnosis for lameness involving stay apparatus structures.

Navicular disease is a differential diagnosis for lameness involving stay apparatus structures.

• A. Distal sesamoidean ligament injury
• B. SDFT/DDFT tendinopathy
• C. Suspensory ligament desmitis
• D. Navicular disease

Answer: (D)

The idea being tested is recognizing diseases that cause lameness through the stay apparatus, with the navicular apparatus as a central component. Navicular disease directly involves the navicular bone and its associated soft tissues (navicular bursa and related ligaments/tendons), so it is a classic cause of lameness localized to the heel area and a primary differential when the stay apparatus is involved. While distal sesamoidean ligament injuries, SDFT/DDFT tendinopathy, and suspensory ligament desmitis can also produce stay-apparatus–related lameness, the statement is pointing to navicular disease itself as the differential diagnosis in question. That makes navicular disease the best match.

The idea being tested is recognizing diseases that cause lameness through the stay apparatus, with the navicular apparatus as a central component. Navicular disease directly involves the navicular bone and its associated soft tissues (navicular bursa and related ligaments/tendons), so it is a classic cause of lameness localized to the heel area and a primary differential when the stay apparatus is involved.

While distal sesamoidean ligament injuries, SDFT/DDFT tendinopathy, and suspensory ligament desmitis can also produce stay-apparatus–related lameness, the statement is pointing to navicular disease itself as the differential diagnosis in question. That makes navicular disease the best match.