What is a jumpers bump when talking about horse confirmation?

From April Reeves, Horseman's U.com: a Jumper's or Hunter's bump is the result of strain to the ligament attachments of the lumbar and sacral vertebrae. It is obvious to the human eye as the top of the hip sticks out above the croup. The 'bump' occurs in the healing process, where scar tissue develops, enlarging that part of the joint.

Over-use in jumping is the primary cause, but this problem can be found in other equine sports. Riding horses too young, either for jumping or often trail riding, where hills are used can create this condition. I have a practice of never jumping over 1'6" until the horse is 5. My motto is to keep my horses forever. Also, jumping over that height more than once a week can increase the chances. Don't forget, that in the training of jumping, there is more training on the ground and flat than over fences. "The quality of the horse on the ground is the quality of the horse in the air" (April Reeves).

While the bump may be painful during the early stages, it often hardens into regular scar tissue. Whether it has a lasting effect on the horse is up to a vet, as outcomes vary. Most horses will find it increasingly difficult to jump during scar tissue development, and like any deep tissue wound, will possibly have some effect on the horse's ability and movement in the future.

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