1. Lateral bed postures curve the spine.
2. Habitual lateral bed postures, by favoring the growth of the spine on one side and retarding it on the other, tend to fix such a curve by establishing physical changes in the bones and ligaments.
3. The time in bed is so large a part of the growing period that the distortion may become pronounced.
4. Inequality in the vertebræ and the supporting ligaments brings about asymmetrical strains in standing and sitting postures, resulting in increased curvature with rotation.
5. Bed posture thus becomes an important factor not only in the etiology of curvature but in its treatment.