Scoliosis is an abnormal lateral (side to side instead of forward or backward) curvature of the spine. This condition often develops in adolescence during the growth spurt before puberty. It is more common in girls than in boys. The exact cause of the most common type of scoliosis is unknown, but it is thought to be familial.
Types of Scoliosis Spinal Curves
Scoliosis can curve to the right (dextroscoliosis) or to the left (levoscoliosis). The most common curves are the following:
- Right thoracic curve: an upper back curve that bends to the right.
- Right thoracolumbar curve: also bends to the right but extends from the upper back (thoracic) to the lower back (lumbar).
- Right lumbar curve: a curve bending to the right that starts and ends in the lower back.
- Double major curve: usually involves a right thoracic curve on top and a left lumbar curve on bottom. Because the two curves may counteract each other in appearance, the deformity may be less obvious.