“To understand how Scheuermann's disease develops, it’s helpful to understand the structure of the upper spine. The vertebrae are more or less cylindrical in shape, and stacked to keep the spine in an upright position.
With Scheuermann's disease, an abnormality causes parts of the vertebrae to grow at different rates during a child’s growth spurt. This variance causes some of the vertebrae to become wedge-shaped, and the stack to look more like a tower that is leaning forward. These changes result in the exaggerated forward curvature of the upper back.”