Navicular Syndrome in Horses: Chronic Forelimb Lameness
Navicular syndrome is a common cause of chronic forelimb lameness in mature horses. Modern treatment extends working careers.
Navicular syndrome (podotrochleosis) is a degenerative condition affecting the navicular bone, deep digital flexor tendon, and associated structures in the hoof. It's one of the most common causes of chronic forelimb lameness in mature horses, particularly in stock-type breeds used for performance.
Key Points
- Navicular syndrome affects the navicular bone, bursa, and deep digital flexor tendon in the hoof
- Quarter Horses, Thoroughbreds, and Warmbloods in high-intensity work are most commonly affected
- Signs include bilateral forelimb lameness, shortened stride, and reluctance to work on hard ground
- Diagnosis requires nerve blocks, X-rays, and sometimes MRI
- Treatment includes corrective shoeing, NSAIDs, bisphosphonates, and navicular bursa injections
- Many horses continue athletic careers with proper management
Understanding Navicular Anatomy
The navicular bone sits behind the coffin bone and under the deep digital flexor tendon (DDFT). It acts as a pulley, changing the direction of the DDFT force. The navicular bursa cushions the tendon as it passes over the bone. In navicular syndrome, degeneration of the navicular bone (bone edema, cysts, sclerosis), inflammation of the bursa, and damage to the DDFT occur. The exact cause is debated — vascular compromise, biomechanical stress, and degenerative change all contribute.
Management & Prognosis
Many horses with navicular syndrome continue athletic careers with appropriate management. Regular farrier care every 4-6 weeks maintains optimal hoof balance. Exercise on soft surfaces reduces concussion. Controlled exercise programs maintain fitness without overstressing the feet. Weight management reduces load. Most horses respond well to combined therapy. The condition is chronic and progressive but manageable. Some horses eventually retire from intense work but remain comfortable for light riding.
When to See a Vet Immediately
- Your horse has chronic bilateral forelimb lameness
- The stride is shortened and choppy, especially on hard ground
- The horse stumbles or drags its toes frequently
- Hoof testers cause pain in the heel region
- The horse is a mature Quarter Horse or Warmblood in performance work
How RVC Can Help
This article is for educational purposes only and does not replace professional veterinary advice. If your pet is showing any symptoms, please contact Royal Veterinary Center immediately at +853 6677 6611.