402 DISEASES OF THE HORSE’S FOOT 
1. Fractures oF tHE Os Coronm. 
Fractures of the os corone result from such causes as we 
have just enumerated, and are nearly always seen in con- 
junction with fractured os suffraginis. When this latter 
bone is also fractured diagnosis is comparatively easy, a 
certain amount of crepitus, even when the suffraginis is 
only split, being obtainable. When the os corone alone 
is fractured then diagnosis is extremely difficult, the small- 
ness of the bone and the comparative rigidity of the parts 
rendering manipulation almost useless, and effectually 
preventing the obtaining of crepitus. It is, in fact, only 
when the bone is broken into many pieces that crepitus 
may be detected, and even then it is slight. 
Reported Cases.—1. ‘The subject was a four-year old 
hunter. While at exercise in the morning of August 10 he 
bolted, got rid of his rider, and ran about in a mad fashion, 
came into contact with a wheelbarrow in a narrow passage, 
and finally came into violent contact with a wall, which had 
the effect of throwing him down. The rider stated that the 
animal suddenly put down his head and managed to get off 
the bridle; he then bolted, and the only chance for the 
rider was to throw himself off. 
‘On examination I found the horse unable to place any 
weight on the off fore-leg, the pastern was swollen and 
painful, the hollow of the heel was also swollen, and there 
was marked constitutional disturbance. 
‘After a short time he would place the heel on the 
ground and elevate the toe to a slight degree. On manipu- 
lating the pastern slight crepitation could be discovered, 
and there was abnormal mobility in the corono-pedal 
articulation. On the near fore-leg there were extensive 
wounds in the region of the knee, and great laceration of 
the tissues. The animal was destroyed. 
‘On examining the leg I found the subcutaneous tissues 
infiltrated from below the knee to the foot, large masses of 
gelatinous blood-stained material being present along the 
flexor tendons and in the hollow of the heel. The inferior 
