Which structure is NOT listed among navicular disease anatomy?

• A. Navicular bursa
• B. DDFT
• C. Impar ligament
• D. Digital extensor tendon

Answer: (D)

The structures typically involved with navicular disease are parts of the navicular apparatus and its supporting ligaments: the navicular bursa sits between the navicular bone and the deep digital flexor tendon, the deep digital flexor tendon itself interacts closely with the navicular region, and the impar ligament connects the navicular bone to the distal phalanx. The digital extensor tendon sits on the dorsal side of the hoof and coffin joint, not within the navicular apparatus, so it isn’t considered part of navicular disease anatomy. That’s why the digital extensor tendon is the structure not listed as part of navicular disease anatomy.