How does long pasterns adversely affect the racing career of a horse?
Why is it such a big negative?
Thank you in advance
Rudy D
Long Pasterns
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I think it has to do with somewhat simple mechanics. Long pasterns at full speed can lead to over-flexion of the ankles (chips, sesamoid fractures) and a horse that "runs down" (back of the fetlock can actually hit the ground). They are simply undesirable in sporthorses also (jumpers with long pasterns don't tend to stay sound for long) so I suppose it would also apply to racehorses. The real question is what is considered "long"?
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Intrinsic Worth
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Shammy Davis
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From an athletic and soundness standpoint, I learned many years ago that the optimum length of the pastern is 1/2 the length of the cannon bone. If less, meaning a short pastern upright pastern, concussion problems like navicular syndrome and foot stress fractures occur. If the pastern is longer than 1/2, then as indicated before suspensory problems occur.
A long pastern quite often places the base of support (from the foot) too far out in front of the horse's leg. The heel of the hoof should support the the cannon bone, knees, etc on up the leg. If the heel of the foot is too far forward, effectively you have a horse that is functionally back at the knee. Since the bones are not aligned correctly, extra stress is placed on the joints (knees and ankles), tendons, and muscles. When the muscles tire, the joints are allowed to flex too far, and this leads to injuries. A long pastern creates a long lever, and it takes more work for the horse to breakover the toe.