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Updated: May 29, 2025
The trabecular framework of the bone undergoes erosion and absorption rarefying ostitis and either disappears altogether or only irregular fragments or sequestra of microscopic dimensions remain in the area affected.
Whether spavin has its point of origin within the articulation as a rarefying ostitis of the cancellated structure of the lower tarsal bones as suggested by Eberlein; or, as Diekerhoff asserts, that the cunean bursa may be the initial point of affection, is unsettled; but it is reasonable to consider occult spavin as having its origin within the articulation, and that cases readily yielding to cunean tenotomy are primarily due to affection of the cunean bursa.
The lesions in the bones resulting from actinomycosis and from mycetoma, have been described with these diseases. These include rickets, scurvy-rickets, osteomalacia, ostitis deformans, osteomyelitis fibrosa, fragilitas ossium, and diseases of the nervous system. Rickets or rachitis is a constitutional disease associated with disturbance of nutrition, and attended with changes in the skeleton.
We shall restrict the term to inflammation in the first of these situations. Inflammation at the ossifying junction is included under the term osteomyelitis. The term rarefying ostitis is applied to any process that is attended with excessive absorption of the framework of a bone, whereby it becomes more porous or spongy than it was before, a condition known as osteoporosis.
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