The pastern is the part of a horse’s lower leg between the fetlock joint and the top of the hoof. It’s a short, angled section made up of two bones and a joint, and it plays a critical role in absorbing the shock of each stride. If you’ve heard the term while shopping for a horse, watching a vet exam, or reading about hoof care, here’s what you need to know about this small but important structure.
Bones and Joints of the Pastern
The pastern contains two bones stacked on top of each other. The upper one is called the long pastern bone (P1), and the lower one is the short pastern bone (P2), which is roughly half the length of P1. The joint between them is the pastern joint, a true hinge-style joint that allows flexion and extension as the horse moves.
Above the pastern, the long pastern bone meets the cannon bone at the fetlock joint. Below it, the short pastern bone connects to the coffin bone (P3) inside the hoof capsule at the coffin joint. So the pastern is essentially a bridge: it links the visible leg above to the hidden structures inside the hoof below. That position makes it a load-bearing connection point every time the horse’s foot hits the ground.
How the Pastern Absorbs Shock
The pastern’s angle and flexibility are central to how a horse handles impact. As the foot lands, the pastern bones compress downward onto a wedge-shaped cushion made of elastic tissue and cartilage that sits inside the hoof, just behind the coffin bone. This cushion gets squeezed between the pastern bones and the bottom of the foot, pushing outward against the cartilage on each side of the hoof. That outward push disperses the force of landing rather than sending it straight up the leg.
The long pastern bone also increases flexibility at the fetlock joint, which is the major shock-absorbing hinge above. Together, the angle of the pastern and the flex of the fetlock act like a suspension system. Horses with a good pastern angle move more smoothly because the impact energy is spread across multiple joints and soft tissues instead of jolting through the bones.
What a Good Pastern Angle Looks Like
When viewed from the side, the pastern should slope at roughly 45 degrees from the ground. This angle typically matches the angle of the horse’s shoulder, which is one reason evaluators look at both when assessing conformation. A well-angled pastern creates a smooth, fluid stride because it allows the fetlock to flex and recover naturally with each step.
The pastern angle should also line up with the hoof angle. If the hoof wall and pastern form a continuous, straight line when seen from the side, the forces traveling through the leg are distributed evenly. A broken angle, where the pastern tilts one way and the hoof another, concentrates stress at the joints and can lead to problems over time. Farriers pay close attention to this alignment when trimming and shoeing.
Long Pasterns vs. Short Pasterns
Pastern length varies from horse to horse, and it comes with trade-offs. Horses with longer pasterns tend to have more spring in their gaits. The extra length gives the fetlock more room to flex, which can make a ride feel smoother and more elastic. This is often desirable in sport horses bred for dressage or jumping. But if those pasterns are too long or too weak, the ligaments and tendons in the area are more vulnerable to strain and injury. The structures simply have more load to manage over a greater distance.
Short, upright pasterns are the opposite. They’re strong and durable, but they absorb less shock. Horses built this way often feel stiffer to ride and show less flexibility in their movement. Over time, the reduced cushioning can increase concussive stress on the joints and hooves. The ideal sits in the middle: a moderate length with a consistent slope that balances shock absorption with structural support.
Pastern Dermatitis (Scratches)
The skin over the pastern is prone to a condition commonly called “scratches” or pastern dermatitis. This isn’t a single disease but a cluster of skin problems triggered by different causes: prolonged moisture, bacterial or fungal infections, mites, allergies, drug reactions, or even sun sensitivity on white-skinned legs. Because the pastern sits low and often stays damp in muddy or wet conditions, it’s a prime spot for irritation to take hold.
Early signs include patchy redness, oozing, crusting, and small erosions or ulcers on the skin around the pastern. The area may swell, and the skin often becomes itchy and sensitive to touch. Most cases show up on both hind legs, though one, three, or all four limbs can be affected. In more advanced cases, lameness can develop and become severe. Secondary bacterial infections are common and can make treatment and recovery more difficult.
Preventing scratches comes down to keeping the pastern area clean and dry. Avoiding prolonged exposure to mud, standing water, and dirty bedding reduces risk significantly. Horses with heavy feathering (long hair around the fetlock and pastern) need extra attention since that hair traps moisture against the skin.
Checking Pasterns During Grooming
The pastern is easy to overlook during routine care because it’s a small area, but a quick daily check can catch problems early. When you pick up a hoof or brush the lower legs, run your hand down the pastern and feel for heat, swelling, or any flinching when you apply light pressure. Compare one leg to the other. Subtle differences in temperature or firmness can signal inflammation in the joint or soft tissue before obvious lameness appears.
Look at the skin itself, especially on the back of the pastern where it folds near the heel bulbs. This is where scratches and other skin conditions tend to start. Crustiness, scabbing, or damp, raw-looking patches warrant closer attention. On horses with white markings, sunburn and photosensitivity reactions can also show up here, so check for redness after turnout on bright days.