A treatise on orthopedic surgery . out and the whole,properly covered with felt and fitted. (Ridlon and Jones.) If the jacket is used it may be extended to a single or doublespica for the same purpose as has been mentioned. Such appli-ances are useful when psoas spasm and cramp are trouble-some symptoms. In disease of the cervical region a certain amount of supportand fixation may be obtained by collars of poroplastic felt, TUBEBCULOUS DISEASE OF THE SPINE. 103 plaster of Paris, or other material. The Thomas collar ( and 71) is the best of this type of support, but none of themis thorou
A treatise on orthopedic surgery . out and the whole,properly covered with felt and fitted. (Ridlon and Jones.) If the jacket is used it may be extended to a single or doublespica for the same purpose as has been mentioned. Such appli-ances are useful when psoas spasm and cramp are trouble-some symptoms. In disease of the cervical region a certain amount of supportand fixation may be obtained by collars of poroplastic felt, TUBEBCULOUS DISEASE OF THE SPINE. 103 plaster of Paris, or other material. The Thomas collar ( and 71) is the best of this type of support, but none of themis thoroughly efficient unless used with a brace to control thelarger movements of the spine. They are useful in emergencies,but they are not often required when proper braces can beobtained. In the final stage of treatment, the Knight brace, a light steelframe with corset front, may be used (Fig. 74) or a long corsetsimilar to that ordinarily worn by women, but strengthened bythe insertion of light steel bars, may be sufficient. Fig. The Thomas collar applied. (Ridlon and Jones.) Many other forms of apparatus of greater or less merit mightbe described, but space has permitted only a detailed account ofthree forms that, it would seem, best represent the essentialprinciples involved in the treatment of Potts disease. The Principles of Treatment in Their Practical Application.—Theeffect of treatment must be estimated not simply by its reliefof the symptoms of the disease, since deformity may increasein spite of the apparent well-being of the patient, but it mustbe selected and continued or changed with the aim of com- 104 OETHOPEDIC SUEGEEY. bating ultimate defonnitT, and on this standard success orfailure must be determined. Indications for Treatment by Recumbency.—As lias been statedalready, the most important influence toward deformity isthe force of gravity; therefore, horizontal fixation in overexten-sion is the most efficient means of preventing deformity, and ofassuring th
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