DISEASES FROM FAULTY CONFORMATION 1$7 
turning the nut on the screw the clamps are brought towards 
each other, and the crack thus prevented from spreadi ag.’ 
Still a further useful clamp is that of Koster. This is 
considerably broader than the clamp of Vachette, and its 
gripping edges are provided with teeth (see Fig. 89) 
As with the clamp of Vachette so with this, a groove is 
burned into the wall on each side of the crack for the 
accommodation of the jaws of the instrument, and the 
clamp itself pressed home by means of a special pair of 
forceps. This form of clamp holds well, and has the 
advantage of securing a wider area of horn than that of 
Vachette or McGill. 
Fig. 89.—KosteEr’s Sanp-cralcK Cuamp. 
i 
Clamping by any method should’ be advised or under- 
taken only under certain conditions. The horn should be 
moderately strong, and the wall / should be thick. This 
practically restricts the use of the clamp to cracks of the 
toe, and it is there, as a fact, : ‘they are found of most 
benefit. While burning the grooves for the clamp, and 
while tightening the clamp itself, the animal’s foot should 
be on the ground and bearing weight at the heels, thus 
insuring the greatest possible, approximation of the edges of 
the crack. 
With all methods of clamping an untoward result is 
sometimes the formation jot a fresh crack at the point of 
insertion of the clamps. , 
(c) By the Use of Thin Metal Plates.—These are of use 
when the horn of the wall is too thin to allow of clamping, 
and are therefore of cnedal use in cracks of the quarters. 
* Veterinarian, vol. Ixi., p. 141. 
