[Illustration: FIG. 125.--Tuberculous Disease of Child's Tibia,
showing sequestrum in medullary cavity, and increase in girth from
excess of new bone.]
_Clinical Features._--As a rule, it is only in superficially placed
bones, such as the tibia, ulna, clavicle, mandible, or phalanges, that
tuberculous disease in the marrow gives rise to signs sufficiently
definite to allow of its clinical recognition. In the vertebrae, or in
the bones of deeply seated joints, such as the hip or shoulder, the
existence of tuberculous lesions in the marrow can only be inferred from
indirect signs--such, for example, as rigidity and curvature in the case
of the spine, or from the symptoms of grave and persistent joint-disease
in the case of the hip or shoulder.
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