EXOSTOSIS. «473 
r 5 centimeters. When friction or firing have been applied, the skin 
nd subcutaneous tissues are indurated, and sometimes a thick layer of 
ubcutaneous structure has to be divided before the tendon is exposed ; the 
emorrhage is quite abundant. The index finger introduced into the 
round detects the tendons, it is raised with scissors introduced underneath 
t, divided with the bistouri and a piece of it amputated. The wound may be 
eft open or is closed by one or two stitches. The synovial flow soon 
yecomes purulent and may last for two or three weeks, but gradually 
lisappears. 
There is often advantage to combine tarsal tenotomy with firing. Im- 
nediate relief, spoken of by Lafosse and Mandel, must not be expected. 
Setting up, animals are ordinarily as lame 
ufter as before the operation : it demands 
1 certain time for the beneficial effects 
to be seen. The mode of action of this 
tenotomy is complicated. Not only does 
it make the tendinous cord loose, the 
pressure of which was one of the causes 
of the lasting lameness; but it also 
activates the inflammatory process and 
thus hastens ankylosis, in case of recent 
osteo-arthritis. On these accounts it is 
indicated, no matter what are the size, 
the situation or age of the exostosis. 
Dieckerhoff has advised the dividing 
of the cunean sheath from the fold of 
the hock or origin of the tendon to its 
insertion on the cuneiform ‘ he operates i ye er tape BO 
with the bistouri, the animal stand- Ganean branch: 
ing. After the operation, quite a large 
swelling is formed; the wound suppurates ; cicatrization takes place in 
two, three or four weeks. Two weeks later, the animal can be re- 
turned to work. In 1875 he made known the results of this practice, 
and out of thirty-six cases of spavin with lameness operated upon, twenty- 
one made an almost complete recovery, eight were improved, seven failed. 
Periostotomy of Petérs has given Miller good results. Here is the 
modus operandi. The internal face of the hock well exposed, the hair is 
cut on the lower parts of the region, on a level with the spavin ; the skin is 
aseptisised. With the bistouri a narrow incision is made, on the inferior 
line of the hock, towards the middle and transversely to the internal face, 
through which curved scissors are pushed under the skin, first upward and 
forward, and then upward and backward ; thus forming two tracts arranged 
