This paper summarizes the University of Iowa's 50+ year prospective natural history study of untreated adolescent idiopathic scoliosis. It tracks outcomes — including mortality, pulmonary function, back pain, curve progression, pregnancy, and psychosocial function — from diagnosis through an average patient age of 66 years. The goal is to give patients and families an accurate, evidence-based understanding of what untreated AIS actually looks like over a lifetime.
For decades, the 1968 Swedish studies told surgeons that untreated scoliosis meant early death, disability, and cardiopulmonary failure. Those studies mixed idiopathic, congenital, and neuromuscular curves together — the Iowa data, with 50+ years of true AIS follow-up, corrects the record.
When you see an AIS patient at skeletal maturity with a curve under 30°, reassure the family: progression is unlikely. When the curve is 50–75° thoracic, it will probably keep growing and warrants close follow-up or intervention.
For pulmonary counseling, the threshold that matters is ≥50° Cobb at maturity for functional decline, and >80° thoracic apex for symptomatic dyspnea. Lumbar curves, even large ones, carry far less pulmonary risk.
Do not omit cosmetic and psychosocial impact from your counseling. One-third of untreated patients reported a limited life, and many wished surgical options had been offered to them earlier.
This paper summarizes the University of Iowa's 50+ year prospective natural history study of untreated adolescent idiopathic scoliosis. It tracks outcomes — including mortality, pulmonary function, back pain, curve progression, pregnancy, and psychosocial function — from diagnosis through an average patient age of 66 years. The goal is to give patients and families an accurate, evidence-based understanding of what untreated AIS actually looks like over a lifetime.
For decades, the 1968 Swedish studies told surgeons that untreated scoliosis meant early death, disability, and cardiopulmonary failure. Those studies mixed idiopathic, congenital, and neuromuscular curves together — the Iowa data, with 50+ years of true AIS follow-up, corrects the record.
When you see an AIS patient at skeletal maturity with a curve under 30°, reassure the family: progression is unlikely. When the curve is 50–75° thoracic, it will probably keep growing and warrants close follow-up or intervention.
For pulmonary counseling, the threshold that matters is ≥50° Cobb at maturity for functional decline, and >80° thoracic apex for symptomatic dyspnea. Lumbar curves, even large ones, carry far less pulmonary risk.
Do not omit cosmetic and psychosocial impact from your counseling. One-third of untreated patients reported a limited life, and many wished surgical options had been offered to them earlier.