骶骨融合为正常现象。
在腰椎下是五个椎骨融合在一起形成的骶骨。
The five vertebrae next to the lumber vertebrae are fused together to form the sacrum.
背景资料摘要：为了防止远端退化或矢状面失衡而进行的已存在特发性脊柱侧凸扩展融合至骶骨手术与假关节的高发生率相关。
Summary of Background Data. Extension of an existing idiopathic scoliosis fusion to the sacrum for distal degeneration or sagittal imbalance has been associated with a high rate of pseudarthrosis.
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