The four types of scoliosis are idiopathic, functional, neuromuscular, and degenerative. Idiopathic is determined by the age of onset. Functional scoliosis is when a curvature of the spine is a result of something going on somewhere else in the body. Neuromuscular scoliosis occurs during development of the spine. Degenerative scoliosis happens when the spine changes over time due to arthritis. For more information, go to http://www.medicinenet.com/scoliosis/article.htm.