EINaBONE. 



249 



Ringbone (Fig. 87). 



is the vague term apiDlied to bony deposits on the pastern bones, 

 and is, for convenience sake, divided into three kinds, namely: — 

 (1) False ringhane, which may be regarded as a bony deposit 

 on the long pasteni bone, situated on one or both sides 

 of it : in some cases it extends to the front of the 

 bone. This form, although not nearly such a serious affection 



Y\g. 87. — -Ringbone on ofif fore. 



as the next two kinds, occasionally causes lameness on account 

 of its presence interfering with the action of the lower portion of 

 the suspensory ligament. Also, it is sometimes accompanied by 

 a diseased condition of the ujDper (articulating) surface of the 

 long pastern bone, with the probable result of incurable lameness. 

 In such cases, the lower surface of the cannon bone, which comes 

 in contact with the diseased surface in question, is rarely affected. 

 At the same time, we must remember that even when the bony 

 deposit does not involve its neighbouring joint, it may from its 

 size and consequent interference with tendon or ligament, as in 

 Figs. 88 and 90, cause incurable lameness. (2) High ringbone 



