A punctured wound is always dangerous; the hazard in this, as in every species of injury, is greatly increased when inflicted on parts liable to any vast amount of motion. Thus, punctures occurring over the stifle-joint too often set our best surgery at defiance. The muscles of the hind leg contract with every movement of the body. Added to that, the part abounds with fascia.
The majority of these wounds heal by suppuration. Fascia is a substance no pus can penetrate, and which is more easily rent than punctured. The exit of the secretion, therefore, is opposed in many directions, while the ceaseless motion occasions the matter to burrow. The sinuses thus produced are by the fascia guided to the stifle-joint; and, when once the synovial cavity is polluted by the intrusion of the unhealthy pus, all the best efforts of science are useless.
When a punctured wound occurs, the skin, being elastic, stretches before the instrument by which the wound is inflicted. The soft parts beneath the skin, not being elastic to the same degree as the integument, break down before the penetrating force. They are torn or lacerated; for generally the muscles receive a larger injury than would be calculated from the size of the instrument by which the blow was inflicted. The rent flesh must be cast off by a slough—corruption generally attends that process. Much of the pus secreted cannot find an exit through the opening in the skin; a large portion of it is confined within the puncture. There it decays, and, being impelled by the motion of the limb, readily finds its way in all directions save the upward one.
No judgment approaching to accuracy can be formed at the first sight of a punctured wound. The probe may ascertain the depth of the injury, but it cannot tell the extent of damage done to the interior of the body. Therefore, whether the hoof is pierced by a nail, or the muscles are lacerated by the shaft of a cart—be the instrument large or small—the consequences likely to follow upon the injury cannot be foretold.
DIAGRAM OF A CONTUSED
WOUND.
A contusion, in its mildest form, is simply a bruise. Injuries of this class, when of magnitude, are very deceptive; the surface is unstained by blood, and there is no flesh exposed. For these reasons the ignorant are apt to disregard such accidents, and to express surprise when they terminate otherwise than kindly. When a bruise happens, blood is effused in smaller or larger quantities according to the extent of the injury. A small quantity of effused blood, sufficient to discolor the human skin, may be absorbed; but when the amount is large, the powers of nature are defied. The blood thrown out, not being taken up again, congeals, and ultimately corrupts. Then an abscess or a slough is necessitated; both are attended with danger: the first may be deep seated or superficial; either form is attended by much weakness. That generates considerable irritation, and may even be the cause of fatal hemorrhage; or it may lead to sinuses, the direction, the number, or extent of which, when they do occur, is not to be predicated. A bruise is, consequently, not to be judged of hastily. The amount of pain which it provokes is even unworthy dependence, as the injury may have hurt the bone or the tendon; and then, though the accident is rendered very serious, in the first instance no sign of agony announces the extent of the evil.
With regard to treatment, when a lacerated wound occurs, the first attention should be paid to the system, which has always been much shaken. Give, therefore, the drink composed of one ounce each of laudanum and sulphuric ether, with half a pint of water; repeat it every quarter of an hour till the shivering natural to the horse on these occasions has disappeared, and the pulse has recovered its healthy tone.
Avoid all poultices of the ordinary kind; one composed of one-fourth yeast and three-fourths of any coarse grain, excepting bran, may be applied. So also may a lotion thus composed:—
Lotion for Lacerated Wounds.