Navicular Syndrome in Horses: Causes, Symptoms & Treatment

Navicular syndrome is one of the most common causes of chronic forelimb lameness in horses, yet it remains one of the most misunderstood conditions in equine medicine. If your horse has been diagnosed with navicular — or you suspect something isn’t right — understanding the condition thoroughly is the first step towards effective management.

This guide covers everything horse owners need to know about navicular in horses, from the underlying causes and early warning signs to modern diagnostic techniques and the latest treatment options available in the UK.

What Is Navicular Syndrome?

Navicular syndrome (also called navicular disease or podotrochlear syndrome) refers to pain originating from the navicular bone and its surrounding structures within the horse’s hoof. The navicular bone is a small, boat-shaped bone that sits behind the coffin bone in each front foot, acting as a fulcrum for the deep digital flexor tendon (DDFT) as it passes over the back of the foot.

Rather than a single disease, navicular syndrome is now understood as a collection of problems affecting the:

• Navicular bone — degeneration, cysts, fractures, or remodelling
• Navicular bursa — inflammation between the bone and the DDFT
• Deep digital flexor tendon — adhesions or fibrillation where it contacts the bone
• Collateral ligaments — strain or tearing of the ligaments supporting the navicular bone
• Impar ligament — connecting the navicular bone to the coffin bone

This broader understanding is why many vets now prefer the term “podotrochlear syndrome” — it reflects the fact that multiple structures can be involved, not just the navicular bone itself.

Which Horses Are Most at Risk?

Navicular syndrome predominantly affects the front feet, where approximately 95% of cases occur. Certain types of horses are more susceptible:

• Thoroughbreds — particularly those in demanding ridden work
• Warmbloods — commonly affected due to their size and workload
• Quarter Horses — genetically predisposed, especially stock-type horses
• Horses with upright pasterns — conformational predisposition increases concussive forces
• Horses with small feet relative to body size — greater pressure per unit area on the navicular region

The condition typically develops between 7 and 14 years of age, though it can appear earlier in horses with poor conformation or those working on hard ground regularly.

Causes of Navicular Syndrome

The exact cause of navicular syndrome is still debated among equine veterinarians, but research points to several contributing factors:

Biomechanical Stress

Repetitive compression of the navicular bone by the DDFT during locomotion is considered the primary driver. Every time the horse’s foot lands, the tendon presses against the navicular bone. Over thousands of strides, this can cause progressive damage — particularly on hard or uneven surfaces.

Reduced Blood Supply

The navicular bone has a limited blood supply compared to other bones. Researchers believe that repeated concussion may compromise blood flow further, leading to ischaemic damage (tissue death from insufficient blood supply). This can trigger bone remodelling and degeneration over time.

Conformational Factors

Horses with certain conformational traits are at higher risk:

• Upright pastern angles (greater than 55°)
• Broken-back hoof-pastern axis
• Long toes with low, collapsed heels
• Narrow, boxy feet
• Disproportionately small hooves for body mass

Poor Hoof Balance and Farriery

Infrequent or improper farriery is a significant contributing factor. Long toes increase the breakover distance, placing greater strain on the DDFT and navicular bone. Collapsed heels shift the horse’s weight onto the back of the foot, directly loading the navicular region.

Workload and Surface

Horses regularly worked on hard ground — whether tarmac roads, firm arena surfaces, or sun-baked fields — experience greater concussive forces through the navicular area. Jumping, fast work, and tight turns compound the problem.

Symptoms of Navicular Syndrome

Navicular syndrome typically develops gradually, making early detection challenging. Watch for these signs:

Early Signs

• Intermittent, mild lameness — often worse on hard ground or tight circles
• Shortened stride — the horse lands toe-first rather than heel-first to avoid loading the painful area
• Reluctance to work — subtle performance changes, refusing jumps, or becoming “lazy”
• Shifting weight — pointing one foot forward at rest, or constantly shifting weight between front feet
• Stumbling — more frequent tripping, particularly on uneven ground

Progressive Signs

• Bilateral lameness — both front feet affected, making it appear as stiffness rather than obvious lameness
• Pottery gait — short, choppy strides that look stiff and uncomfortable
• Worsening on circles — notably lamer when the affected limb is on the inside of a circle
• Reluctance to go downhill — increased loading of the navicular area on slopes
• Muscle wastage — reduced muscle mass across the chest and shoulders from compensating movement patterns

Because both front feet are often affected simultaneously, navicular syndrome can be mistaken for general stiffness, arthritis, or even a back problem. If your horse’s performance has gradually declined without an obvious cause, navicular should be on the list of possibilities.

Diagnosing Navicular Syndrome

Accurate diagnosis requires a systematic approach by your veterinary surgeon. The process typically involves:

Clinical Examination

Your vet will observe the horse in walk and trot on both hard and soft surfaces, in straight lines and on circles. They’ll look for characteristic toe-first landing, shortened stride, and whether lameness worsens on tight circles.

Hoof Testers

Applying pressure across the central third of the frog with hoof testers can elicit a pain response in horses with navicular involvement, though this test alone is not definitive.

Nerve Blocks

Palmar digital nerve blocks (also called “heeling” the horse) are a key diagnostic step. Local anaesthetic is injected around the nerves supplying the back of the foot. If the lameness improves significantly within 10–15 minutes, the pain source is localised to the navicular region. More specific blocks (navicular bursa injection) can further pinpoint the affected structure.

Radiography (X-rays)

X-rays of the navicular bone can reveal changes such as:

• Enlarged or increased number of synovial fossae (the tiny channels in the bone)
• Bone cysts or areas of lysis
• Changes to the bone’s shape or outline
• New bone formation (enthesophytes) at ligament attachments
• Loss of the normal smooth flexor surface

However, radiographic changes don’t always correlate with the degree of lameness — some horses with significant X-ray changes show minimal symptoms, and vice versa.

MRI

Magnetic resonance imaging has revolutionised navicular diagnostics and is now considered the gold standard. MRI can visualise soft tissues that X-rays cannot, including the DDFT, collateral ligaments, navicular bursa, and impar ligament. Standing MRI units are available at many UK equine hospitals, meaning general anaesthesia isn’t always necessary.

MRI findings often reveal the specific structure causing pain, which directly informs the treatment plan. Research from the British Equine Veterinary Association (BEVA) has shown that MRI changes the diagnosis in up to 40% of cases compared to X-rays alone.

Treatment Options for Navicular Syndrome

There is no cure for navicular syndrome, but many horses can be managed successfully and remain comfortable in work for years. Treatment typically combines several approaches:

Corrective Farriery

This is the cornerstone of navicular management. A skilled farrier working alongside your vet can make dramatic improvements through:

• Easing breakover — rolling or rockering the toe to reduce strain on the DDFT
• Supporting the heels — egg bar shoes or heart bar shoes redistribute pressure away from the navicular area
• Correcting hoof-pastern axis — bringing the hoof angle into alignment with the pastern
• Providing cushioning — pads (leather or synthetic) between the shoe and hoof to absorb concussion
• Shortening the shoeing cycle — every 4–5 weeks rather than 6–8, to maintain optimal balance

Many farriers now use natural balance or four-point trimming principles for navicular horses, focusing on physiological hoof balance rather than simply matching angles.

Anti-Inflammatory Medication

Non-steroidal anti-inflammatory drugs (NSAIDs) such as phenylbutazone (“bute”) remain a mainstay for managing navicular pain. Your vet may recommend:

• Phenylbutazone — effective and affordable, but long-term use requires monitoring for gastric ulcers
• Meloxicam — better gastric safety profile, suitable for longer-term use
• Firocoxib (Equioxx) — a COX-2 selective NSAID with fewer gastrointestinal side effects

NSAIDs manage symptoms but don’t address the underlying pathology, so they’re best used alongside other treatments.

Corticosteroid Injections

Direct injection of corticosteroids into the navicular bursa or coffin joint can provide targeted anti-inflammatory relief. This is usually performed under ultrasound or radiographic guidance. Results vary — some horses improve dramatically for 3–12 months, while others show minimal response.

Regenerative Therapies

Modern regenerative medicine has opened new doors for navicular treatment in the UK:

• Platelet-Rich Plasma (PRP) — the horse’s own blood is processed to concentrate growth factors, then injected into the affected area. PRP can promote tissue healing in damaged tendons and ligaments.
• IRAP (Interleukin-1 Receptor Antagonist Protein) — an autologous blood product that blocks inflammatory proteins. Particularly useful for navicular bursa inflammation.
• Stem cell therapy — still relatively new for navicular cases, but showing promise in early studies for DDFT lesions associated with navicular syndrome.

Extracorporeal Shockwave Therapy (ESWT)

Shockwave therapy delivers focused acoustic waves to the affected area, stimulating blood flow and promoting healing. Several UK equine hospitals now offer this treatment for navicular cases, typically as a course of 3 treatments at 2–3 week intervals. Results are encouraging, particularly for horses with ligament or tendon involvement rather than primary bone disease.

Isoxsuprine

This vasodilator medication was traditionally prescribed to improve blood flow to the navicular bone. While still used by some vets, evidence for its effectiveness is mixed. Modern research suggests its benefits may be more related to a mild anti-inflammatory effect than genuine vasodilation within the hoof.

Navicular Neurectomy

As a last resort, palmar digital neurectomy (cutting the nerves to the back of the foot) can be considered. This removes the horse’s ability to feel pain in the navicular area, allowing return to soundness. However, it carries significant risks:

• Loss of protective sensation — the horse can’t feel injuries to the heel area
• Potential for neuroma formation (painful nerve regrowth)
• Progressive deterioration of the navicular bone without pain-guided protection
• Limited lifespan of the procedure — nerves may partially regenerate

Neurectomy is generally only considered when all other options have been exhausted and the horse cannot be kept comfortable otherwise.

Management and Lifestyle Changes

Beyond veterinary treatment, daily management plays a crucial role in keeping a navicular horse comfortable:

Exercise

• Maintain regular, controlled exercise — complete rest often worsens navicular syndrome. Light, consistent work promotes blood flow to the hoof
• Work on soft, even surfaces — arena surfaces, well-maintained grass, or synthetic tracks
• Avoid hard ground — tarmac, frozen fields, and rocky tracks increase concussion
• Minimise tight circles — use large circles (20m+) and straight lines where possible
• Reduce jumping — or lower the heights to reduce concussive landing forces
• Warm up thoroughly — a good 15-minute walk warm-up helps before asking for trot or canter work

Turnout

• Provide turnout on soft ground where possible
• Avoid waterlogged or very hard paddocks
• Consider hoof boots for turnout if the ground is variable
• Some horses benefit from overnight stabling on a deep, supportive bed (shavings or rubber matting)

Weight Management

Excess body weight increases the load on the navicular area with every stride. Maintaining your horse at an ideal body condition score (3–3.5 out of 5) is one of the simplest but most effective management strategies. Native breeds and good doers on rich grass need particular attention.

Supplements

Some owners report benefits from joint supplements containing glucosamine, chondroitin, and MSM, though scientific evidence for their efficacy in navicular syndrome specifically is limited. Omega-3 fatty acids (from linseed oil) may offer mild anti-inflammatory support.

Prognosis

The outlook for horses with navicular syndrome varies considerably depending on the severity of changes and the structures involved:

• Mild cases caught early — often managed successfully for many years with corrective farriery and exercise modification alone
• Moderate cases — most horses can remain comfortable in light to moderate work with a combination of farriery, medication, and management changes
• Severe cases with significant bone or DDFT damage — may be limited to light hacking or retirement from ridden work, though quality of life can still be good

Early diagnosis and intervention are key. Horses whose navicular syndrome is identified and treated promptly have a significantly better long-term prognosis than those diagnosed late.

How Long Can a Horse Live With Navicular?

Navicular syndrome is a manageable condition, not a death sentence. It does not directly shorten a horse’s natural lifespan, and with good farriery, appropriate medication and a sensible workload, many horses stay comfortable and in light to moderate work for years after diagnosis. The decision a horse owner eventually faces is not usually about lifespan but about quality of life: a horse that can no longer be kept comfortable in the field, even with pain relief, is one where euthanasia becomes a kind and responsible option. That point varies enormously from horse to horse, and is a conversation to have with your vet rather than a fixed timeline. Early diagnosis and consistent management are the single biggest factors in keeping a navicular horse sound and happy for as long as possible.

When to Call the Vet

Contact your vet if you notice:

• A gradual decline in performance without obvious cause
• Your horse consistently landing toe-first at walk or trot
• Lameness that worsens on hard ground or tight circles
• Pointing a front foot forward at rest, or shifting weight frequently
• Reluctance to go downhill or on uneven ground
• A positive response to hoof testers over the frog area

The earlier navicular syndrome is diagnosed, the more treatment options are available and the better the likely outcome.

Frequently Asked Questions