. Diseases of the horse's foot. Hoofs; Horses. DISEASES OF THE JOINTS 433 articulation often participate in the inflammatory changes, and in many cases become completely ossified. The true articulatory surface of the bone, that articulating with the OS pedis and with the os coronae, is never affected. Causes.—In enumerating the causes of navicular disease, we shall follow the example of Colonel Smith and classify them under certain headings—namely, (1) Hereditary Pre- disposition ; (2) Compression; (3) Concussion; (4) A Weak Navicular Bone; (5) A Defective or Irregidar Blood-supply to the Bone
. Diseases of the horse's foot. Hoofs; Horses. DISEASES OF THE JOINTS 433 articulation often participate in the inflammatory changes, and in many cases become completely ossified. The true articulatory surface of the bone, that articulating with the OS pedis and with the os coronae, is never affected. Causes.—In enumerating the causes of navicular disease, we shall follow the example of Colonel Smith and classify them under certain headings—namely, (1) Hereditary Pre- disposition ; (2) Compression; (3) Concussion; (4) A Weak Navicular Bone; (5) A Defective or Irregidar Blood-supply to the Bone ; and (6) Senile Fig. 163.—The Navicular Bone from a Case of Long-standing Navicular Disease. The erosion of the cartilage on its central ridge is most marked, and the porous appearance of the bone thus uncovered points to the existence within it of a rarefactive ostitis. Along its edges large osteophytic outgrowths speak of the effects of an osteoplastic periostitis. 1. Hereditary Predisposition.—That navicular disease is hereditary is a fact that has for a long time been insisted on, and has come to be so generally admitted that we do not intend to dwell on it here. As we have said before, it is found in the lighter breeds of horses (and, according to Zundel, especially in the English breeds), and is there seen to be frequently transmitted from parent to offspring. 2. Compression.—By this is meant the compression of the navicular bone between the os pedis and the os coronae in front, and the perforans tendon behind. In order to appreciate this explanation of the causation of navicular disease at its true value, it will be well to con- sider briefly the physiology of the parts in question. 28. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Reeks, H. Caulton. London : Bailière, Tindall e
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Keywords: ., bookcentury1900, bookdecade1900, booksubjecthorses, bookyear1906
