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a A 13-year-old girl with a double major curve of AIS. The DVR direction of the lumbar curve is the opposite to the direction of the thoracic DVR. b Bending radiographs show that L3 is cross mid-sacral line and L3 rotation is less than grade 2 (type A). This is fused to the NV-1 (L3). c Both thoracic and lumbar curves are treated with two rods, the translation and DVR
