Adult idiopathic scoliosis is scoliosis in an adult that began during adolescence as Adolescent Idiopathic Scoliosis (AIS) and progresses into adulthood.
Research shows that a scoliosis curve less than 30° at maturity (no additional growth) is unlikely to progress significantly during adulthood. However, a curve greater than 30° is likely to progress 0.5° to 2° per year.