Hoof rotation in laminitis: what happens?

What is the lamellar connection?

Inside the hoof wall lies a remarkable tissue: the lamellae. These are microscopically small finger-like projections that firmly attach the coffin bone (os pedis) to the inner surface 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 — effortlessly supporting a 600 kg horse on its feet. In laminitis, it is precisely these lamellae that become inflamed and damaged due to reduced blood flow, causing that connection to weaken.

How does rotation actually occur?

When the lamellae die off due to inflammation, the coffin bone loses its firm anchorage. The deep digital flexor tendon continuously pulls on the back of the coffin bone. When the lamellae are no longer strong enough to resist that pulling force, the tip of the coffin bone rotates downward, towards the sole. In severe cases, the tip of the coffin bone can break through the sole — also referred to as 'penetration' or sinking. Rotation is measured in degrees on an X-ray: even at 5 degrees there is a significant displacement; more than 10–15 degrees is considered severe.

Signs you can spot at home

Rotation does not happen overnight. These early warning signs call for immediate action:

• Typical 'laminitis stance': weight shifted onto the hind legs, front legs stretched forward
• Elevated pulse in the digital artery (palpable on the inside of the pastern joint)
• Warmth in the hoof walls, even in cold weather
• Reluctance to turn or walk on hard surfaces
• Visible growth rings in the hoof wall that are not parallel to the coronary band

Diagnosis: X-ray is the gold standard

Only X-rays can definitively establish whether and by how much the coffin bone has rotated. The vet 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 sole thickness — normally at least 15–20 mm — is also a crucial measurement. A thin sole increases the risk of the coffin bone tip penetrating through. Based on these images, the farrier draws up a treatment plan for orthopaedic shoeing or bandaging.

Treatment: rest, shoeing and nutrition

The treatment of hoof rotation revolves around three pillars, always implemented in consultation with your vet and farrier:

• Deep sand box or soft straw bed: distributes weight evenly across the entire sole
• Orthopaedic shoeing: raises the heel to reduce the pull of the deep digital flexor tendon
• Strict diet: eliminate grain and sugar-rich grass, maximum 1.5% body weight in low-NSC forage
• Pain management: NSAIDs such as phenylbutazone in consultation with the vet
• Regular X-ray checks: every 6–8 weeks to monitor recovery

Long-term management and digital dossier

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