516 



THE DISEASES OF THE HORSE 



EXOSTOSIS OF THE HUMERUS AND SCAPULA 



Tin: HEADS of the boxes adjacent to most of the joints of tlie body are 

 more or less subject to exostosis, thougli not so frequently as those of the 

 pastern-bones and tarsus. Kext to these probably conies the shoulder joint, 

 the neighbourhood of wliich is often the seat of this disease, but seldom to 



Fig. P6.— Asciivi.osis of the Shoulder Joint from Exostosis. 



A. Si'apula. 



B. Humerus. 



C. D. Exostosis around the sin ulJer joint producing 

 anchylosis. 



the extent shown in the case from which tlie accompanying engraving is 

 taken. It represents the left scapula and humerus of a horse, which were 

 completely anchylo.sed, and of course there co-existed a proportionate amount 

 i>f lameness during the progress of the disease, while after the anchylosis 

 took i>lace the want of action must have been complete. An examination 

 by the hand of the point of the shoulder would readily detect so large a 

 growth of bone as this ; but smaller ones are occasionally thrown out beneath 



