NAVICULAR DISEASE. 
643 
preparatory to sale. Best and the inflammation produced in the fibro- 
fatty frog may, however, assist adhesion between the navicular bone and 
flexor tendons. Frog-setons were first recommended by Sewell, who 
constructed a special sharply-curved needle with a handle and sharp 
point (fig. 252) for the purpose of inserting them. The seton is best 
passed in the standing position, the limb being fixed by means of a knee- 
hobble (see p. 13 of Dollar’s “ Operative Technique ”), otherwise the foot 
Fig. 251.— Straight seton needle. Fig. 252.— Curved seton needle. 
may be moved during operation, and the needle broken. The point of 
the frog is first pared away, and a twitch having been applied to the 
nose or ear, the needle, previously threaded, is thrust into the hollow of 
the heel, through the plantar cushion and sensitive frog, so as to emerge 
at the point of the frog. The handle is then removed, the needle drawn 
through the frog, and the ends of the tape knotted together at the heel. 
The seton is left in position twelve to fourteen days, being moved daily 
to allow free discharge of pus. Sometimes it is saturated with oil of 
turpentine. 
T T 2 
