A treatise on orthopedic surgery . istalten for that of spondylitis deformans. from the shoulders may be a factor in the etiology. These andother possible contributing causes should be investigated in allcases of this character. A more extreme type of deformity is sometimes seen in ado-lescents (Fig. 168), induced apparently by posture and byoverwork, although in most instances it may be assumed that aslighter deformity of long standing has served as a predisposingcause. In this type the deformity is resistant, and is accom- DEFOBMITIES OF THE SPINE. 227 panied by adaptive changes in the verte


A treatise on orthopedic surgery . istalten for that of spondylitis deformans. from the shoulders may be a factor in the etiology. These andother possible contributing causes should be investigated in allcases of this character. A more extreme type of deformity is sometimes seen in ado-lescents (Fig. 168), induced apparently by posture and byoverwork, although in most instances it may be assumed that aslighter deformity of long standing has served as a predisposingcause. In this type the deformity is resistant, and is accom- DEFOBMITIES OF THE SPINE. 227 panied by adaptive changes in the vertebrae that prevent com-plete correction. Ssmiptoms.—The most important symptom is the deformityitself. In adolescent cases there is often some discomfort ofthe nature of strain and tire usually referred to the scapularregion but in the rigid type the pain is most marked below theprojection. Treatment.—Even slight posterior curvatures of the spinecheck the expansion of the chest and disturb the balance of the Fig. 169. Fig. Exercises for the correction of posterior curvatures of the spine. (Hoffa.) body. ? Furthermore as it has been demonstrated by X-ray pic-tures that the internal viscera may be lifted from three to sixinches by muscular effort in the erect posture, it is apparent thatserious and permanent displacement of these organs may resultfrom habitual deformity. The treatment is similar to that of lateral curvature. Theassumption of the military attitude, with the head erect, the 228 OETHOPEDIC SVBGEEY. cliin depressed, the shoulders thrown back, the chest expanded,and the abdomen retracted, should be encouraged. And thoseexercises that expand the chest and that strengthen the musclesof the upper jiart of the spine are especiallv important. (Suchexercises are illustrated by Figs. 112, 113, 119, 120, 131, 132,133, 134, 136, 139, 150, and 151.) If the range of verticalextension of the arms is limited, this restriction must be over-come before the deformity of the


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