Curb is?

• A. Inflammation of the digital cushion
• B. Fracture of navicular bone
• C. Inflammation of the plantar ligament
• D. Infection of synovial bursa

Answer: (C)

Curb is inflammation of the plantar ligament. The plantar ligament runs along the underside of the hock and helps stabilize the joint during weight bearing. When it’s repeatedly strained, the tissue becomes inflamed and thickened, producing a firm swelling on the plantar side of the hock—the curb. This differs from inflammation of the digital cushion (soft tissue under the hoof), a navicular bone fracture (bone injury near the navicular region), or infection of a synovial bursa (joint-space infection with broader swelling and possible systemic signs).