Veterinary notes for horse owners : a manual of horse medicine and surgery . ue to pain in the part may be of a mostinveterate form. We have here ulceration of the surfacesof the bones which form the gliding joints without bonebeing deposited between or about them. In health, the dif- SPAVIN. 257 ferent bones of a joint never toiicli each other; as they areseparated by articular cartilage. In ordinary bone spavin, thiscartilage becomes ulcerated as the result of inflammation extendingfrom the bones, and is finally absorbed; the exudation thrown outfrom the blood-vessels of the bones being conv
Veterinary notes for horse owners : a manual of horse medicine and surgery . ue to pain in the part may be of a mostinveterate form. We have here ulceration of the surfacesof the bones which form the gliding joints without bonebeing deposited between or about them. In health, the dif- SPAVIN. 257 ferent bones of a joint never toiicli each other; as they areseparated by articular cartilage. In ordinary bone spavin, thiscartilage becomes ulcerated as the result of inflammation extendingfrom the bones, and is finally absorbed; the exudation thrown outfrom the blood-vessels of the bones being converted into bonymaterial, which causes bony union and consequent destruction ofthe joint. Here, we have a reparative process with cessation ofinflammation. In occult spavin, on the contrary, the process stopsshort at ulceration, and no reparative action takes place; hence,the serious and intractable nature of this form of the disease. TendoJh ofgastrocnemhxs extemas.^ Perfariuis tendoTi Tibi CL Astragaiu^. Laiye ciuiei/orm -Median ciaieifimn. _ Large metatarsal { CaiUKOTV). PerfoTotus teitdoiv Os ailcis X-Os culvis - -Perforatus Perfbrans l- - Cuboid- bone Small cuneifbmv_. Small sjduit borie^ Fig. 98.—Inner side of off hock. Occult spavin is naturally much more common in old, than in younghorses; for, in the latter, repair is much more active than inthe former. As the inflammation, and not the deposit, consti-tutes the disease, we must regard bone and occult spavin as oneand the same complaint. SYMPTOMS.—The lameness of spavin is characterised by wantof freedom in bending the hock, which causes the horse to draghis toe and to wear the hoof at that part (Fig. 1); and by thelameness getting better as he warms up at exercise. In severe 17 258 DISEASES OF BONE. cases, and especially in occult spavin, the lameness consists in asort of spasmodic catching up of the spavined limb the momentthe heel of the foot comes down upon the ground, something afterthe manner of stringhalt (Per
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