Segmental cobb angle in sagittal plane and neutrality chin brow-vertical angle are very important to rebuild the balance of spine in sagittal plane.

• 测量脊柱矢状面不同部位的后凸角度,根据颏眉垂线角,确定截骨部位和后凸角度对于重建矢状面平衡具有重要意义。