354 DISEASES OF THE HORSES FOOT 



their first incision along the lower border of the coronary 

 cushion (see Fig. 140), afterwards exposing the lower half 

 of the cartilage by removing a half-moon-shaped portion of 

 the thinned horn and underlying sensitive laminae (see 

 Fig. 140, b). 



This done, the external face of the cartilage is separated 

 from the skin of the coronet. To do this a double sage- 

 knife is run flatwise between the coronarv cushion and the 



Fig. 140. — Excision of the Lateral Cartilage. (After 

 Moller and Frick.) 



a, The thinned horny wall covering the coronary cushion ; b, the 

 lateral cartilage exposed by stripping off the thinned wall ; c, the 

 sensitive laminae. 



cartilage, with the convex surface of the blade towards the 

 skin. The knife is then passed backwards and forwards 

 until the necessary separation is accomplished. During 

 these movements of the knife a finger of the unoccupied 

 hand should follow the knife, and guard the coronary 

 cushion against injury. 



Following this, the inner surface of the cartilage must be 

 also separated from the structures lying beneath it. To 



