OPERATIONS—PERIOSTEOTOMY. 449 
OPERATIONS—PERIOSTEOTOMY. 
This operation was first applied to the horse by the late Professor 
Sewell. It is intended to relieve the lameness consequent upon exostosis 
A PAIR OF ROWELING SCISSORS, FOR A SETON NEEDLE ARMED WITH A TAPE, A, AND FIXED INTO 
MAKING SMALL INCISIONS THROUGH A HOLLOW HANDLE BY MEANS OF A SCREW, B. 
THE HORSE’S SKIN. 
situated on the shin-bone. <A pair of roweling scissors are first employed 
to snip the skin above and below the tumor. Then a blunt seton needle, 
A BLUNT SETON NEEDLE. A TUMOR BEING CUT WITH A PROBE-POINTED KNIFE. 
being fixed into a hollow handle by means of a screw, and armed with a 
tape knotted at one end, is to be used. The needle is violently driven 
through, and breaks down the cellular tissue which attaches the skin to 
the tumor. The point is forced to enter at one snip and come out at 
the other, after which the needle is withdrawn by the first opening. <A 
probe-pointed knife is then introduced into the space thus made; the tu- 
mor is sliced into as many pieces as may please the operator or the nature 
of the growth will admit of. The knife is afterward retracted, and the 
needle, released from the handle, is passed through the openings, or in 
at one snip and out at the other. The knot at the end of the tape pre- 
vents that being drawn after the needle. The unknotted end is next 
withdrawn from the needle and tied into a large knot—the whole form- 
ing a seton. The operation is occasionally varied by smearing the tape 
with terebinthinate of cantharides, and sometimes by blistering over 
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