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In a retrospective follow-up study of 64 patients with adolescent idiopathic scoliosis, the initial correction of Boston brace with straight lumbar profile strongly predicted good treatment results at follow-up (mean, 4.8 years). If the initial correction was >50%, the curve was permanently reduced with an average of 7.2°. The average initial correction was 62%. This initial brace effect was preserved in another comparable group of 60 patients treated with a Boston brace with 15° lumbar lordosis. It is concluded that the Boston brace is effective in the conservative treatment of idiopathic scoliosis, and the corrective ability seemingly does not deteriorate with a change in the brace design from 0 to 15° lordosis.