A lateral curvature of the spine.  Scoliosis affects boys and girls between the ages of 8 and 18.  It is more common with girls.  There are several causes of scoliosis, the two most common are congenital and habitual.  Congenital scoliosis occurs when someone is born with a lateral curvature of the spine.  Habitual causes are environmental or situational depending on the habits of the individual.  Carrying backpacks improperly can contribute to a spinal distortion.  Poor sitting habits and practicing poor posture can also affect spinal development in children.  Signs of scoliosis are a high hip (uneven hips), a high shoulder, the head being off center, head tilt, back and leg pain.