The term scoliosis has originated from Greek word skolios which was used to denote crooked.
Scoliosis is a condition in which a person’s spine has an abnormal curvature from side to side. For definition purpose the deformity should be greater than 10 degrees.
The primary deformity in scoliosis is lateral flexion plus rotation of the involved vertebrae around a vertical axis it. Usually it is associated with truncal asymmetry.
In a normal individual the spine, when viewed from the rear, looks straight. However the spine of an individual with scoliosis may look more like an “S” or a “C” depending on the direction of abnormal curves.