A treatise on orthopedic surgery . if the lateral deviation of the lumbar spine isextreme the pelvis may be so tilted that the limb on the elevatedside becomes apparently shorter than its fellow. In changes that have been described the contents of the trunk LATEBAL CURVATURE OF THE SPINE. 161 participate to a greater or less degree. The lung on the convexside is compressed by the distorted ribs and by the displacedvertebral bodies. The heart may be displaced laterally or inother directions according to the character of the deformity,and the bloodvessels are changed in direction, and, it may be
A treatise on orthopedic surgery . if the lateral deviation of the lumbar spine isextreme the pelvis may be so tilted that the limb on the elevatedside becomes apparently shorter than its fellow. In changes that have been described the contents of the trunk LATEBAL CURVATURE OF THE SPINE. 161 participate to a greater or less degree. The lung on the convexside is compressed by the distorted ribs and by the displacedvertebral bodies. The heart may be displaced laterally or inother directions according to the character of the deformity,and the bloodvessels are changed in direction, and, it may be,altered in calibre. In those cases in which the thorax is mark-edly distorted the effect is similar to that of the deformity ofPotts disease; respiration is shallow and rapid, the pulse-rateis usually increased, and other evidences of interference withthe vital functions may be apparent. The abdominal organs areaffected, doubtless, in a similar manner, but symptoms due tothis cause are not, as a rule, as clearly marked. Fig. Deformity of the thorax in scoliosis. (Hoffa.) Bachmann^ investigated the secondary changes induced bysevere scoliotic deformity coming under his observation in thepathological institute of Breslau. In per cent, of the sub-jects defect or disease of the circulatory apparatus, and in cent, of the respiratory organs was observed. Etiology—Relative Frequency.—Lateral curvature of thespine is one of the most common of deformities. In a periodof years 3252 cases were recorded in the out-patient dej)art-ment of the Hospital for Euptured and Crippled, a number ^ Bachmann, Die Veranderungen an den inneren Organen bei hoch-gradigen Skoliosen und Kyphoskoliosen, Bibliotheca Medica, 1900, Ab. , H. 162 OETHOPEDIC SUEGEEY. only exceeded by that of bow-legs, of which 5030 cases weretreated. The relative frequency of lateral curvature araong childrenin general is illustrated by the statistics of Drachmann. whofound among 28,175 school-child
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