AN ESSAY ON CHRONIC PODOTUOCHOLITIS. 
527 
1. — FRACTURE OF THE COFFIN BONE. 
This is distinguished from podotrocholitis by very evident and 
continuous lameness. The strong pulsation of the lateral arteries 
may be perceived very shortly, if not immediately, after the acci- 
dent ; there is also a degree of swelling and heat round about the 
coronet. These symptoms, added to the increased temperature of 
the hoof, either do not present themselves at all in podotrocholitis, 
or only become perceptible when they have existed for some con- 
siderable time. Compression of the sole, and of the wall of the 
hoof, will sometimes, but not always, produce pain in cases of 
fracture. 
II. — RUPTURE OF THE FLEXOR TENDON. 
A great degree of lameness, accompanied with pulsation of the 
lateral arteries — a painful swelling, fluctuating or oedematous, 
taking its rise above and along the tendon — the slight degree of 
tension of the tendon ; all these are characteristics which render 
mistake impossible. 
III. — INCIPIENT RINGBONE. 
When a calcareous mass is deposited around the articulation of 
the coronet bone, the senses of sight and touch will prevent all 
error. If the exostosis is only in its birth, and nothing but in- 
flammation is yet apparent, the two diseases may be the more 
easily confounded, from the circumstance of the bony deposit not 
being yet evident, and the lameness which accompanies this mor- 
bid process differing but slightly from that induced by podotro- 
cholitis. The more intense lameness occasioned by ringbone, the 
heat round the coronet joint, if compared with the negative signs 
furnished by the symptomatology of podotrocholitis, will insure a 
just diagnostic. 
IV. — INFLAMMATION OF THE TROCHLEA OF THE FETLOCK. 
I am not aware that any description has hitherto been given of 
this affection, which, as regards its nature and the form which it 
assumes, exactly resembles chronic podotrocholitis. An inflam- 
mation, slow in its progress, and of a chronic nature, attacks the 
sesamoid bones: caries, which begins by invading the superior 
circumference of these bones, is the ordinary consequence of this. 
In other cases, the inflammation has its beginning in bursa mucosa; 
