Idiopathic scoliosis is, in some ways, a diagnosis of exclusion. However, idiopathic scoliosis is by far the most common
type of spinal deformity with a prevalence of one to three per100 (curves of greater than 10°) in an equal proportion of
boys and girls (15-18). Meanwhile, the prevalence of curves
greater than 30° is one to three per 1000 with a 1:8 ratio of boys to girls (18-20). Patients are divided into age at which
the scoliosis presents – infantile idiopathic scoliosis in
patients zero to three years of age (0.5% of idiopathic scoliosis), juvenile idiopathic scoliosis in patients four to 10 years
of age (10.5% of idiopathic scoliosis), and AIS in patients
older than 10 years of age (89% of idiopathic scoliosis)