The edge of the knife is now toward the shoulder or haunch, and the vessels lie upon that side of the blade which is nearest to the bone. The operator now, by a simple motion of the hand, turns the cutting edge of the knife toward the posterior part of the limb. A man at the same moment takes hold of the leg and forces it straight; the perforans tendon is thus dragged against the knife, while the suspensory ligament and vessels are safe at the back of the blade. If the tendon be not divided without any effort on the part of the operator, he makes a sawing motion as he withdraws the knife. A slight sensation or a feeble sound often testifies the separation of the structure.
THE TENDON DIVIDED.
Often, if the contraction be not chronic, the strength of the extensor pedis muscle, when released from its opponent's force, is sufficient to straighten the fetlock. When the disease, however, has existed for any time, it requires some violence to break down the false attachments which have been formed. For this purpose the knee of a strong man is placed in front of the fetlock-joint, and the horse's foot is, by pulling hard, drawn forward.
The wound is then closed with a pin and twisted thread, as in neurotomy, and the animal, till junction is perfected, should be kept in the stable, as the shoe to be worn afterward is not favorable to progression. One week after the operation, a shoe, with a projecting piece at the toe about one inch and a half long, is to be put on the foot of the diseased limb. Five weeks after this, the shoe is to be replaced by one having the projecting point twice as long; and this last is to be worn till union is supposed to be perfected—till the expiration of three months at least.
THE SHOE TO BE WORN ONE WEEK
AFTER DIVISION OF THE TENDON
HAS BEEN ACCOMPLISHED.
THE SHOE TO BE PUT ON SIX WEEKS AFTER
DIVISION OF THE TENDON, AND TO BE WORN
UNTIL UNION IS PERFECTED.