464 VETERINARY SURGICAL THERAPEUTICS. 
parts and drained ; frequent antiseptic irrigations will prevent purulen 
resorption. 
As soon as delimitation is operated the pus changes aspect; fron 
serous, it becomes whitish, thicker; at that time, if the sequestrun 
is isolated and not incarcerated, nothing is easier than to extract it 
After free incising, it is taken hold of with forceps and brought outwards 
—Phalangectomy has been performed by’Garcin (1834) on a mule, suf 
‘fering with a nail in the foot; the os pedis, entirely necrosed, was hel 
only by “a very small ligamentous band,” it was removed entirely ; afte 
four months the animal “was returned to work, and though lame, wa 
able to do it for two years after.” In a heifer suffering with nail in thi 
foot with necrosis, Delafond, in 1838, performed sesamoddectomy 
«Nineteen days after, there was scarcely any lameness, the animal te 
covering completely.” 
The operation is also easy when the bone, though invaginated in a thick 
bony box, communicates with the exterior by a large opening, througt 
‘which it may pass; it can be secured and brought out with forceps 
When the cloaca are narrow, recovery is more difficult ;.it necessitate: 
_ sequestrotomy or necrotomy. If the sequestrum is left to itself, suppura- 
tion becomes abundant and the patient becomes weak; but hasty inter. 
ference is dangerous; the bony envelope must be of a sufficient strengtl 
not to break during the manipulation of the operation—a point of great 
importance, should it occur on bones of an extremity. 
Interference decided upon, the soft parts are divided, in saving bloo¢ 
vessels and nerves, and the incision connecting all fistulous tracts together, 
-as muchas possible. The region being chronically inflamed, the hemorrhage 
is always abundant; esmarchisation, or at least a rubber cord placed at 
‘the upper part of the leg, are good precautions. Reaching the bone, the 
~periosteum is dissected loose, and then, with the trephine or the gauge 
-and mallet, a piece of bone is removed, wide enough to permit the ex- 
-ploration of the suppurating cavity. Sometimes one meets with a dia 
physis entirely necrosed, then he is obliged to enlarge the opening, “tc 
remove the cover of the bony coffin where lays the dead diaphysis.” In 
-such cases, it is prudent to divide the sequestrum, so as not to reduce tc 
_-excess the resistance of the protective envelope. The cavity is curetted, 
irrigated, plugged with iodoformed gauze; antiseptic dressings favor the 
-complete repair of the trauma. One can conceive the disturbances that 
such operations demand and how long must recovery be. In very young 
‘subjects, where repairing power is great, success is possible; but ofter 
lameness remains, incompatible with economical exploitation of animals 
For this reason, in large animals, abstention is the rule, even when thé 
~extraction of the sequestrum is easy. 
