712 OPERATIONS ON THE FOOT. 



forward, with necrosis of the tendon of the extensor muscle; with 

 the inflammation of the joint; with caries of the os pedis, and 

 even to assume the cartilaginous form of the disease by its exten- 

 sion to the cartilages of the foot. 



After the recovery of the sub-horny quittor, if the coronary 

 band has been mortified in its entire depth, the foot may present 

 permanent longitudinal fissures, or seams, or transversal grooves, 

 presenting evidences of the existence of a cicatricial tissue when 

 the quittor was in progress. 



II. Prognosis. — The gravity of this quittor dei^ends upon 

 the depth of the disease. "When superficial and affecting only 

 the surface of the tissue, it is easy to cure, but if deeply seated 

 it is more serious, on account of the possibility of complications. 



III. Etiology. — Bruises and violent blows are the ordinary 

 causes of sub-horny quittor. It is commonly due to overreach- 

 ing, or to the wounds occurring when animals are wearing long 

 caulks, as in winter. The irritating effect of frozen mud has also 

 been admitted as a cause. 



IV. Treatment. — The sujjerficial quittor requires a simple 

 treatment. Emollient baths and maturating poultices are then 

 indicated. It is a good plan to thin the wall with the rasjD or the 

 sage knife over the whole extent of the furuncular tumor to a 

 height of about two fingers. A comjn-ess of chloroformed oil, 

 while it alleviates the pain, is also indicated to soften the wall. 

 It frequently becomes necessary to puncture the tumor, but we 

 j)refer to cauterize it with a pointed iron, following the cauteriza- 

 tion with a poultice of honey with Venice turpentine or camphor. 

 Some authors recommend astringent baths, as oak bark, or of 

 sulphate of iron. It is often the case that after some interval fol- 

 lowing sloughing of the hoiirhillon, the wound continues to dis- 

 charge a liquid secretion, which is an evidence that there is a ten- 

 dency to accumulation of matter toward the lateral cartilage, or 

 under the wall, in the laminae ; or that there is some carious spot 

 existing. In the first, if probing horizontally, a cavity is de- 

 tected, it is convincing evidence that a cartilaginous quittor is in 

 com-se of development ; in the second case, the pressure and col- 

 lection of the matter increases the inflammation of the laminse, 

 separates the wall, and complicates the disease, necessitating the 

 operation of the suh-ho7-ny quittor. 



The removal of the portion of the hoof which covers the lesion. 



