A treatise on orthopedic surgery . Fig. 166).Thus, the causes of an abnormal increase in the jDOsterior curva-ture of the spine are very numerous. It is, as has been stated,the characteristic attitude of weakness, as is illustrated in in-fancy and in old age. It is one of the common occupationdeformities of adult life; it is a common postural deformity ofchildhood and adolescence. It may be induced by a variety ofdiseases that lessen the resistance of the spine or that interfere DEFOBMITIES OF THE SPINE. 225 with its function. For example, by rhachitis, spondylitis de-formans, osteitis deforma
A treatise on orthopedic surgery . Fig. 166).Thus, the causes of an abnormal increase in the jDOsterior curva-ture of the spine are very numerous. It is, as has been stated,the characteristic attitude of weakness, as is illustrated in in-fancy and in old age. It is one of the common occupationdeformities of adult life; it is a common postural deformity ofchildhood and adolescence. It may be induced by a variety ofdiseases that lessen the resistance of the spine or that interfere DEFOBMITIES OF THE SPINE. 225 with its function. For example, by rhachitis, spondylitis de-formans, osteitis deformans, Potts disease, and affections of asimilar nature. The kyphosis of rhachitis is most marked in the lower region,that of spondylitis deformans may involve the entire spine,while the simple postural curvature is most marked in the upperdorsal region— round shoulders. In a number of the posturaldeformities the increase in the dorsal kyphosis is balanced by anincreased lordosis, and in this form there is simply an exag- FiG. Marked posterior curvature of the spine apparently induced by weakness Inci-dental to illness. geration of the normal curves of the spine—the hollow round back. In other instances there is a general forward droop ofthe trunk in which the lumbar lordosis may be lessened; thisform is more common in childhood—the round back. The forms of kyphosis that are the direct result of diseasehave been described elsewhere. Postural kyphosis— round15 226 OBTEOPEDIC SUBGEB¥. shoulders —is one of the common deformities, and in child-hood its etiology is similar to that of lateral curvature, of whichit may be a predisposing cause. Round shoulders and thieaccompanying so-called flat, but in reality narrow and thereforedeeper, chest may be induced also by obstructions in the respira-tory passages, such as enlarged tonsils, adenoids, and the like,or by bronchitis or heart disease. Another predisposing causeis clothing that prevents the full expansion of the che
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