What is the minimum effective wearing dosage of orthotic intervention in adolescent idiopathic scoliosis?

Patients wearing orthoses for 0 to 6 and 6 to 12 h/day showed significantly lower improvement rates and higher deterioration rates than those in the 12 to 18 and 18 to 24 h/day groups.

No significant differences in treatment outcomes were observed between the 12 to 18 and 18 to 24 h/day groups, nor between the 0 to 6 and 6 to 12 h/day groups.

For surgical deterioration, MEWT estimates at the 5% target risk ranged from 8.1 to 20.6 h/day.

However, for patients with Risser 0 and a baseline Cobb angle > 30°, the model-derived MEWT estimates for target risks of 2% or lower exceeded 24 h/day and were therefore considered clinically infeasible.