. Lateral curvature of the spine and round shoulders . , on the other hand, the rightside of the pelvis of a livingmodel is raised and the uprightspine is left free to move, thetop of the column remains up-right and the spine is curved inthe opposite direction, convexto the left. This is the positionof balance overcoming the posi-tion induced by gravity. Thesense of equilibrium has workedagainst the force of gravity andhas reversed the position nat-ural to the cadaver. Anythingwhich causes any part of thebody to be held in an asym-metrical position will cause alateral deviation of so
. Lateral curvature of the spine and round shoulders . , on the other hand, the rightside of the pelvis of a livingmodel is raised and the uprightspine is left free to move, thetop of the column remains up-right and the spine is curved inthe opposite direction, convexto the left. This is the positionof balance overcoming the posi-tion induced by gravity. Thesense of equilibrium has workedagainst the force of gravity andhas reversed the position nat-ural to the cadaver. Anythingwhich causes any part of thebody to be held in an asym-metrical position will cause alateral deviation of some partof the spine, because a straight, erect spine in the sagittal plane is pos-sible only when the person stands on both feet or sits erect with the armsin similarpositions and the head pointing straight ahead. Every step,every raising of the arm, every tilting of the head is accompanied bya deviation of the spine from the median plane of the body: in otherwords, by a temporary lateral curve which disappears as the symmetricalattitude is Fig. 30.—The Right Side of the PelvisOF THE Cadaver is Raised and theUpper Part of the Spine Falls tothe Left, Making a Lateral CurveConvex to the Right. ^Feiss: Amer. Jour, of Orth. Sur., iv, i, 37. PLASTICITY OF BONE. 41 If there is a visual error that causes the head to be held obliquely;if there is a short leg causing the pelvis to be no longer horizontalbut slanted; if the muscles of one side of the back are paralyzed, theremust be a constant compensation or curve which will still enable thecenter of gravity to be held over the center of support. Wlien such acurved position becomes habitual for any of the reasons given or for
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