. Radiography and radio-therapeutics . accompanying degree of rarefaction of the bones entering into the jointresults from the restriction of movement, and need not necessarily be takenas an indication of the extent of the disease. Ankylosis of the joint mayfollow the healing of the inflammatory process. Displacements of the bonesmay result from destruction of the ends, in the hip-joint this being fre-quently shown as a dislocation upwards. Figures 231 to 234, from a case of infective osteitis of the neck of thefemur, is an instance of non-tuberculous condition of joint involvementwhich clinic
. Radiography and radio-therapeutics . accompanying degree of rarefaction of the bones entering into the jointresults from the restriction of movement, and need not necessarily be takenas an indication of the extent of the disease. Ankylosis of the joint mayfollow the healing of the inflammatory process. Displacements of the bonesmay result from destruction of the ends, in the hip-joint this being fre-quently shown as a dislocation upwards. Figures 231 to 234, from a case of infective osteitis of the neck of thefemur, is an instance of non-tuberculous condition of joint involvementwhich clinically pursued a course similar to a tuberculous condition,except in the early stage which was of an acute inflammatory characterresulting in an abscess formation. In a number of cases where it is desirable to ascertain the extent of thedisease, bismuth paste may be injected into a sinus, and when radiographedit may be found to fill up the sinus and demonstrate the diseased area ofbone. Stereoscopic plates are very useful in such 229.—Radiogram of hand showing injury at themetacarpo-phalangeal joint of imlex base of the phalanx shows, in addition, somerarefaction with expansion of the bone, indicatingprobable tuberculous disease. TUBERCULOUS DISEASES OF JOINTS 263 The radiographer therefore is frequently asked to X-ray fistulse con-nected %vith bone disease by means of an opaque injection into the smus^Beck was the first to call attention to the use of a liquid emulsion of bismuthand vaseline. The composition is generally about one of the former to fourof the latter. When warmed this runs freely into the sinus, or it may beintroduced under pressure from a special syringe.
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