The stay apparatus distributes weight through which structure?

The stay apparatus distributes weight through which structure?

• A. Pastern joint.
• B. Cannon bone.
• C. Navicular complex.
• D. Fetlock joint.

Answer: (C)

The stay apparatus distributes weight through the navicular complex. This distal structure, centered on the navicular bone and its associated ligaments and connections to the deep digital flexor tendon, acts as a fulcrum that transfers body load from the limb’s proximal joints into the coffin joint and distal phalanx. By locking the joints and using this ligamentous-digital setup, the horse can stand with far less muscular effort. The other parts of the limb—the pastern and fetlock joints and the cannon bone—are involved in weight bearing, but the key weight distribution in the stay apparatus is through the navicular complex.

The stay apparatus distributes weight through the navicular complex. This distal structure, centered on the navicular bone and its associated ligaments and connections to the deep digital flexor tendon, acts as a fulcrum that transfers body load from the limb’s proximal joints into the coffin joint and distal phalanx. By locking the joints and using this ligamentous-digital setup, the horse can stand with far less muscular effort. The other parts of the limb—the pastern and fetlock joints and the cannon bone—are involved in weight bearing, but the key weight distribution in the stay apparatus is through the navicular complex.