![]() ![]() At that point, the hoof can lose sole depth. White line disease is insidious, Fraley says, because a horse with it might not show any lameness until it reaches a critical point where the coffin bone is close to rotating. So it isn’t involving sensitive tissue, but the integrity of the hoof wall is so weak that the deep flexor tendon can pull on that coffin bone and rotate it so that it looks like chronic laminitis.” Instead of the coffin bone pulling away from the laminae, it pulls away from the hoof capsule itself. White line disease can also cause some rotation of the coffin bone, like laminitis, but it’s a little different type of rotation. “The difference is where that cavity-a gas pocket-shows up on the X-ray. “White line disease and chronic laminitis can sometimes be confused with each other,” Fraley said. That doesn’t mean that white line disease isn’t serious, though. Again, it doesn’t affect sensitive tissue, just the hard keratin portion of the hoof.” “It originates from hoof wall that was grown six months to a year ago and is now low in the foot, it slowly digests its way up. “White line disease starts at the bottom of the foot and goes up,” Fraley added. White line disease creates a cavity in the hoof wall, starting at ground level, and can cause some rotation of the coffin bone. Photo courtesy of Dr. The fungus involved likes to digest away keratin, which is what makes hair and fingernails, but bacteria often are isolated with it, too. White line disease affects all non-sensitive layers of the foot. “It likes to capitalize on any little defect in the hoof wall that will give these organisms a chance to get up under the hoof wall. Bryan Fraley of Fraley Equine Podiatry at Hagyard Equine Medical Institute. ![]() “White line disease is often a mixed fungal and bacterial infection, and, like thrush, it’s opportunistic,” said Dr. Like thrush, white line disease is a fairly simple hoof ailment that is not terribly difficult to treat, provided it’s caught early. ![]()
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