A treatise on orthopedic surgery . t in this con-nection only one need be considered—anterior may induce deformity by distortion of a lower extremity orby inequality in the length of the limbs due to retardation ofgrowth. It may predispose to deformity by the general weak- X ness that it causes, or the trunk may be unbalanced by loss offunction in one of the upper extremities, but the more extremecases of deformity are caused by unilateral paralysis of themuscles of the trunk. As a result the expansion of one side of 166 OBTROPEDIC SUBGEBT. the thorax is interfered with and th
A treatise on orthopedic surgery . t in this con-nection only one need be considered—anterior may induce deformity by distortion of a lower extremity orby inequality in the length of the limbs due to retardation ofgrowth. It may predispose to deformity by the general weak- X ness that it causes, or the trunk may be unbalanced by loss offunction in one of the upper extremities, but the more extremecases of deformity are caused by unilateral paralysis of themuscles of the trunk. As a result the expansion of one side of 166 OBTROPEDIC SUBGEBT. the thorax is interfered with and the unaffected, or less affected,side taking on increased activity, develops at the expense of thedisabled part. Thus, the convexity of the curve is usuallytoward the sound part. 4. Lateral Curvatuke Secondary to Disease within^THE Thoracic Walls.—The most common cause of deformit;^of this class is persistent empyema. The lung is primarily coi pressed by the effused fluid, and its function is finally impai/ed Fig. 102. Fig. Scoliosis following empyema atthe age of two years. Presentage nineteen years. Scoliosis secondary to lumbar Potts disease inearly childhood. or abolished by the adhesions that form between it and the chestwall, as well as by the extension of the disease to its a result, the side of the chest is retracted while the functionof the unaffected lung is increased (Fig. 102). Thus, as inparalysis, the spine curves with the convexity toward the activeside. LATERAL CUBVATUBE OF THE SPINE. 167 Other affections of the lungs that interfere with the functionof one side may induce lateral curvature, but the influence isless marked and direct than in empyema. 5. Incidental Lateral Cukvatuke.—Lateral curvaturemay be caused by direct injury or by disease of the spine; forexample, by fracture or^by Potts disease, or by other organic Fig. 104. Fig. 105.
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Keywords: ., bookauthorwhitmanr, bookcentury1900, bookdecade1910, bookyear1910
