-478 VETERINARY SURGICAL THERAPEUTICS. 
-or acute laminitis. But soon there appears on the anterior. face of the 
- cannon a diffuse and painful tumefaction. 
The nature of this affection is still a subject of discussion. Williams, 
-Cagny, Moller, believe it periostitis. Abadie has described it as “ teno. 
‘ sitis”’ of the extensors. Weber says it is dye to a lesion of the extensor: 
- and of their sheath. 
Whatever may be its nature, the prognosis of the trouble is not serious, 
Treated at once by blistering application, everything disappears, leaving nc 
mark. If, on the contrary, training is kept up, the symptoms increase; a 
“hard diffused tumor is formed on the anterior face of the cannon, which 
resists cauterization. Still, it does not seem to disturb the action of 
galloping (Cagny). 
Rest is the first indication of a rational treatment ; blistering does the 
rest. Seldom is firing required. Williams advises subcutaneous perios- 
totomy, which, for him, would diminish the duration of the lameness. In 
some cases where the operation has been made with insufficient asepsy, 
- periostitis has become suppurative and complicated with partial necrosis 
of the principal metacarpal. 
VI.— Ringbones—Sidebones—Phalangeal Exostosis. 
Under the name of vizgbones are designated exostosis of the phalangeal 
regions. According to their location, they are divided into those of she 
_ pastern and those of the corone?. These are divided into phalangeal } 
and cartilaginous.» Those exostosis present great interest from the 
‘surgical point of view; as long as they develop, they give rise to lameness, 
which often lasts long, because the growth interferes with the action 
- of tendons and ligaments, or presses painfully on the tissues of the foot. 
All the causes likely to give rise to producing osteo-periostitis may bring 
-on those exostosis; among them particularly. are efforts of locomotion 
which, through the stretchings of the ligaments, irritate the osteogenous 
-coat; violent reactions of the ground, dry arthritis, chronic inflammation 
‘of the peri-bony tissues, diffused exostosis of the pastern and coronet. 
After splits or fractures of the phalanges, or after the operation for deep nail 
in the fort, they are frequently observed. Bony neoformations developed 
-on.a level with the insertion of ligaments, near the articular surfaces, 
sometimes spread and mingle together, surround the joint and bring on a 
false ankylosis. 
While ringbones are often seen on the hind legs, sidebones almost 
--exclusively belong to forelegs. ‘Everyone knows the special affinity 
‘that fibro-cartilaginous tissue has for the elements of bone. As soon as 
1 Ringbones. 2 Sidebones, 
