Lateral curvature of the spine and round shoulders . Fig. 32.—The Right Side of the PelvisOF the Cadaver is Raised and the UpperPart of the Spine Falls to the Left,Making a Lateral Curve Convex to theRight. MECHANISM OF SCOLIOSIS 45 base is broad and the weight of the mass to be supported is compara-tively small. When this structure with only comparatively sHght modificationsis set on end and made to fulfil the functions of a weight-bearingcolumn in a plane at right angles to that for which it is best adapted,certain unfavorable factors are introduced which serve as distinct. Fig. 33.—The Righ
Lateral curvature of the spine and round shoulders . Fig. 32.—The Right Side of the PelvisOF the Cadaver is Raised and the UpperPart of the Spine Falls to the Left,Making a Lateral Curve Convex to theRight. MECHANISM OF SCOLIOSIS 45 base is broad and the weight of the mass to be supported is compara-tively small. When this structure with only comparatively sHght modificationsis set on end and made to fulfil the functions of a weight-bearingcolumn in a plane at right angles to that for which it is best adapted,certain unfavorable factors are introduced which serve as distinct. Fig. 33.—The Right Side of the Pelvis of the Model is Raised and the UpperPart of the Spine is Carried to the Right, Making a Lateral Curve Convex toTHE Left. (Cf. Fig. 44.) limitations. The column constructed to bear weight and sustainstrain at right angles to its long axis must now bear weight and sus-tain strain in its long axis. The two anterior limbs, which formerlyserved as props, now hang as dead weights to be supported by thecolumn. To maintain equilibrium much greater muscular effortis necessary to maintain functional balance in the man than in thequadruped. The viscera hang no longer at right angles to the sup- 46 MECHANISM OF SCOLIOSIS porting structure, but in the line of its long axis. The thorax toexpand has to raise all the ribs and work against gravity. But what is most important in the present connection is the factthat the upright position is decidedly hard to maintain, because thebase of support is so small and the height of structure to be supportedis relatively
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Keywords: ., bookauthorlovettrobertwrobertwi, bookcentury1900, bookdecade1910
