362 DISEASES OF THE HORSE'S FOOT 



parts. This is done that we may be quite certain nothing 

 at all remains calculated to give rise to further trouble. 



It goes without saying that, in addition to the necrosed 

 cartilage, all other diseased and necrotic tissues should also 

 be removed. The os pedis is occasionally found necrotic 

 just where the cartilage joins it, or it may be that a small 

 portion of the sensitive laminae, by reason of its liver- 

 red or even gray coloration, gives evidence of death of 

 the part. 



The former must be well curetted, and the latter cleansed 

 carefully with a scalpel and forceps. 



Fig. 142. — Partial Excision of the Lateral Cartilage by 

 removing a Portion of the Coronary Cushion. 



The dotted lines show the outline of the wedge-shaped portion of 

 structures to be removed, including skin, coronary cushion, 

 horn, and sensitive lamina?. 



a, The opening of the fistula. 



The operation finished, the foot is again douched in an 

 antiseptic solution, the wound mopped dry with carbolized 

 tow, dressed with either of the dressings described on 

 page 358, and finally bandaged. The dressing should be 

 changed every three days only, unless in the meanwhile 

 pawing movements and other symptoms of distress indicate 

 their removal. 



The length of coronary cushion removed in this operation 

 is from J to i inch (we ourselves, however, have seen it 

 more), and yet its loss seems to occasion no serious after- 



