X] 



THE ORGANS OF LOCOMOTION 



137 



amount of pressure which must hievitably affect the pasteni 

 bones, it is easy to understand how an inflammatory condition 

 is Hable to arise in this region. Ring-bone often occurs in 

 association with fractured pasterns, and may result from such 

 causes as galloping on a hard road or on an irregular ground 

 surface. 



Fig. 66. Photo of ring-bone. 

 Side-bone or ossification of the lateral cartilage is common in 

 cart-horses with straight pasterns. It may result from hard 

 work or from going faster than the normal, as with hea\'y' draught 

 horses when made to trot, or ^\ith light horses when over-driven. 

 Side-bone is frequently associated A\ith ring-bone. The lame- 

 ness which results from side-bone is due to the sensitive 

 structures being squeezed between the fetlock bones and the 

 ossified cartilage. 



