A normal spine, when viewed from behind, appears straight. However, a spine affected by scoliosis shows evidence of a lateral, or sideways, curvature, and a rotation of the back bones (vertebrae). Scoliosis is defined as a curvature of the spine measuring 10 degrees or greater on X-ray and can occur in any part of the spine.
Scoliosis is a type of spinal deformity and should not be confused with poor posture. There are many types of scoliosis and they can involve any age group.