Hoofbone rotation in laminitis: what happens?

What is the lamellar connection?

Inside the hoof wall is a special tissue: the lamellae. These are microscopically small finger-like projections that firmly connect the coffin bone (os pedis) to the inside of the hoof wall. There are two types: the sensitive lamellae on the side of the coffin bone and the insensitive lamellae on the side of the hoof wall. Together they form a kind of velcro with enormous load-bearing capacity — they keep a 600 kg horse effortlessly on its feet. In laminitis, these lamellae become inflamed and damaged by reduced blood flow, weakening that connection.

How exactly does rotation occur?

When the lamellae die from inflammation, the coffin bone loses its firm anchorage. The deep flexor tendon continuously pulls on the back of the coffin bone. If the lamellae are no longer strong enough to resist that pulling force, the tip of the coffin bone rotates downward, toward the sole. In severe cases, the tip of the coffin bone can break through the sole — also called 'sinking'. Rotation is measured in degrees on an X-ray: at 5 degrees there is already a significant shift; more than 10-15 degrees is considered serious.

Signals you can observe at home

Rotation doesn't happen overnight. These early warning signs deserve immediate action:

• Typical 'laminitis stance': shifting weight onto hind legs, front legs stretched far forward
• Increased pulse in the fetlock artery (felt on the inside of the fetlock joint)
• Warmth in the hoof walls, even in cold weather
• Reluctance to turn or walk on hard surfaces
• Visible rings in the hoof wall that don't run parallel to the coronary band

Diagnosis: X-ray is the gold standard

Only with X-rays can you determine for certain whether and how much the coffin bone has rotated. The veterinarian takes a standard lateral view (side view) measuring the distance between the front of the hoof wall and the front of the coffin bone. The thickness of the sole — normally at least 15-20 mm — is also a crucial measurement. A thin sole increases the risk of the coffin bone tip breaking through. Based on this image, the farrier creates a treatment plan for orthopedic shoeing or wrapping.

Treatment: rest, shoeing and nutrition

Treating hoofbone rotation revolves around three pillars that you always implement in consultation with your veterinarian and farrier:

• Deep sand box or soft bedding: distributes weight evenly across the entire sole
• Orthopedic shoes: elevate the heel to reduce the pulling force of the deep flexor tendon
• Strict diet: eliminate grain and sugar-rich grass, maximum 1.5% body weight in low-NSC roughage
• Pain management: NSAIDs such as phenylbutazone in consultation with your veterinarian
• Regular X-ray monitoring: every 6-8 weeks to track recovery

Long-term management and digital records

A horse that has once had laminitis with rotation remains vulnerable. Consistent follow-up is essential: keeping track of when shoes were applied, which X-ray measurements were taken and what the feeding plan looks like. In EquiSight's horse record, you store all hoof measurements, shoeing dates and veterinary findings in one place. Through the calendar, you automatically remind yourself of your next farrier appointment. The EquiCoach feature also helps you see patterns: does sensitivity increase during certain periods, for example in a wet spring with lush grass?