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Abstract
The effect of a modified Boston brace with anti-rotatory blades on idiopathic scoliotic curves, mainly right thoracic with a compensatory left lumbar, was studied. Method and Material: Twenty-eight scoliotic children divided into three sub-groups according to the curve type were included in the study. Cobb angle and rotation was measured on posteroanterior spinal radiographs taken during the first examination and also during the follow-up with the children in and out of the brace. Results: Ten curves improved, 13 remained stable and 5 increased (Cobb angle change >5° compared with the initial measurement). The brace treatment had more affect on the double curves, while single curves remained unaffected. Rotation remained unchanged in all curve types except in the lumbar component of double (right thoracic-left lumbar) curves. Discussion: These findings indicate that in curves with a compensatory component (e.g. main thoracic with compensatory lumbar curve), a deforming rotatory force, which is blocked by the de-rotatory action of the blades of the above-modified Boston brace, is present and seems to be more active in the lumbar spine. It is hypothesized that this deforming rotatory force seems to be a major aetiological factor for double curves. In conclusion the conservative treatment using this brace is beneficially affecting the natural history of IS in children.