800 
DISEASES OE TflE FOOT. 
to and fro along its long axis. The knife is used more as a lever than as 
a cutting instrument. Starting in the centre of the cartilage the operator 
first exposes the posterior, then the anterior, surface of the cartilage. 
Care must be taken not to cut either the coronary band or the cartilage. 
The cartilage exposed, the operator seizes one of the single-edged 
knives, slides it into the wound with its cutting edge directed upwards 
and backwards, passes it behind the posterior extremity of the cartilage 
by executing a half turn of the instrument, and then with one stroke 
from within outwards, removes the posterior half of the cartilage, taking 
Fig. 302.—Celluloid injection preparation of the veins and arteries of the foot prepared by 
maceration. The veins are light in colour, the arteries dark. 
care, however, not to injure the upper surface of the sensitive wall. In 
some cases there is very little cartilage at this point to remove, the 
greater portion having become necrotic and been replaced by fibrous 
tissue, which should be spared. 
This completed, the toe of the foot is, by means of a cord passed 
round the fetlock and hoof, extended as far as possible to facilitate 
removal of the anterior half of the cartilage. By extending the foot, the 
capsular ligament of the pedal-joint is drawn away from the cartilage, 
and the danger of injury diminished. The knife is then held horizon¬ 
tally, its convex surface downwards, and the rest of the cartilage 
separated from underlying structures, and removed with dissecting or 
