Objective: To assess the effectiveness of Boston brace treatment in patients with adolescent idiopathic scoliosis who had curvature between 35^oand 45^o
Material and Methods: The medical records of ten patients with idiopathic scoliosis age ≥10 years who had received a Boston brace were reviewed retrospectively to confirm idiopathic etiology, determine the brace prescribed, and estimate compliance. Cobb angles, Risser signs, rotational pedicles and King classification were measured from radiographs at presentation, and during follow up and brace discontinuation. Progression was defined as an increase in curve magnitude of 6^o. Surgical progression was defined as progression to 50^oor increase in curve magnitude of 6^o.
Results: The average age at brace prescription was 12.8 years, and 80% were Risser 3-4. Curve magnitude at brace prescription averaged 39.2^o. Compliance was good in 90% of patients. Duration of treatment averaged 14 months. Progression of 6^ooccurred in 30%, and 90% reached surgical thresholds.
Conclusion: Bracing of patients with adolescent idiopathic scoliosis who had a curve between 35^o-45^oand skeletal maturity was ineffective. This may have been caused by slow growth, few subjects and the retrospective nature of the study.