LAMENESS IN THE PHALANGEAL REGION. 77 



of the coronet joint is nsuallj much more severe than 

 navicular lameness. 



4. Contracted Sole. — This condition is rare, and often 

 exceedingly difficult to differentiate from navicular disease. 

 The generally accepted points of difference are as follows: 

 While there is throbbing in the digital arteries in contracted 

 sole, there is none in navicular disease ; in the latter the 

 entire hoof atrophies ; in contracted sole there is only a 

 narrowing of the inferior border of the hoof. Little red 

 spots are found in the white line in contracted sole, but not 

 in navicular disease. (See page 152.J 



5. Contracted Quarters.— Are easily mistaken for navicular 

 disease ; in contracted quarters there is usually throbbing 

 in the digital arteries and pain on compressing the quarters, 

 which is not found in navicular disease. Should contracted 

 quarters be a consequence of navicular disease, the pressure 

 upon the frog, to demonstrate pain, must decide. 



