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Professor Parrot mentions a case worth quoting. One of the crania had been trepanned, the position of the operation showing that its object had been to treat an osteitis. The operation had succeeded, and the cicatrization of the bones, both about the wound and in the parts originally affected, shows that recovery was complete.
On the other hand, resolution may occur during the stage of periosteal inflammation, or, an exostosis forms which causes no interference with function. Before there is evidence of an exostosis, diagnosis of ringbone is not easy, for it is then a problem of detecting the presence of a ligamentous sprain, periostitis, or osteitis.
Varying pathological developments often result from concussion, contusion or other violent shocks to the bony structures. In such cases there either follows a simple periostitis which may resolve spontaneously with no obvious outward symptom, or osteitis, which may occur with tissue changes, as in exostosis; or the case may produce any degree of reaction between these two possible extremes.
Exostosis of the first and second phalanges is usually due to some form of injury, whether it be a contusion, a lacerated wound which damages the periosteum, or periostititis and osteitis incited by concussions of locomotion, or ligamentous strain. Practically the only exception is in the rachitic form of ringbone which affects young animals.
In the present state of our knowledge, insufficient as it is, this explanation is the most. plausible. It is even more difficult to come to a satisfactory conclusion with regard to European examples of the practice we have been describing. Trepanation was certainly practised in the treatment of certain diseases of the bone, such as osteitis or caries.
Acromegaly is distinguished from osteitis deformans in that it is limited to hypertrophy of the hands, feet, and face, and it usually begins earlier. In gigantism the so-called "giant growth of bones" is often congenital in character, and is unaccompanied by inflammatory symptoms. The deformities of the articulations may be congenital but in most cases are acquired.
Short, upright, pasterns receive greater concussion during fast travel on hard roads than do the longer more sloping and well formed extremities. Those who are advocates of the theory that this type of osteitis with its complications has its origin in the articular portion of the joint, claim that the upright pastern constitutes an important tendency toward ringbone.
Rarefying Osteitis, or Degenerative Changes. Certain bone affections, such as osteomalacia or osteoporosis, are in the main, responsible for distortions and morphological changes of bone, causing lameness, permanent blemish and even resulting in death of the affected animal.
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