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Radiograph of a horse hoof showing rotation of the coffin bone and evidence of sinking, a condition often associated with laminitis. The annotation P2 stands for the middle phalanx, or pastern bone, and P3 denotes the distal phalanx, or coffin bone. The yellow lines mark the distance between the top and bottom part of the coffin bone relative ...
Hoof or horseshoe wear can indicate breakover and if the horse is dragging its toes. Change in shape of the hoof wall is also common in horses with laminitis. "Founder rings," or thickened concentric rings in the hoof wall, indicate a past episode of laminitis. Concavity of the dorsal (front) surface of the hoof can indicate chronic laminitis.
The contralateral (opposite) leg then bears all of the weight, which reduces blood flow to the hoof and strains the attachments of the laminae, leading to laminitis. Although support-limb laminitis is a risk for any horse that is not weight-bearing lame, occurring in roughly 16% of cases, it is uncommon in foals and yearlings. [ 135 ]
As with laminitis, different horses may respond in different ways to a given technique, so the farrier, owner, and veterinarian should work as a team to formulate a plan and to adapt if the initial plan is not effective. People who choose to treat navicular disease through shoeing may use a shoe designed to lift and support the heels. [13]
The insensitive laminae coming in from the hoof wall connects to the sensitive laminae layer, containing the blood supply and nerves, which is attached to the coffin bone. [1] The lamina is a critical structure for hoof health, [ 1 ] therefore any injury to the hoof or its support system can in turn affect the coffin bone.
They also point out, however, that the use of shoes can be beneficial in many instances. [6] This includes times when wear of the hoof exceeds its growth, or when extra traction is needed for horses in competition. [6] Horseshoes can also be used to correct lameness, stabilize hoof cracks, and realign bone in the case of laminitis. [6]
By July 13, Barbaro had developed a severe case of laminitis in the left hind hoof—a potentially life-threatening affliction that is common in horses who shift weight to one hoof for extended periods to keep pressure off an injured hoof. A procedure called a hoof wall resection removed 80% of his left rear hoof. The remaining 20% of his hoof ...
Support limb laminitis, which is the specific type Barbaro had, is caused by over-stressing the good leg during recovery from an injury in the opposite limb. [15] [16] A 1986 survey done by the Morris Animal Foundation found that laminitis was the fourth leading cause of death among horses. [17]