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a A 17-year-old girl with a double major curve, type B. The DVR direction of the lumbar curve is the opposite to the direction of the thoracic DVR. b Bending radiographs show that L3 not cross mid sacral line and L3 rotation is more than grade II (type B), which is fused to the NV (L4). c The patient is treated with two rods, rod derotation and DVR
