All the eases had displayed horn fusion by X-ray, and spine pseudoarticulation formation and the internal fixation loosening or breakage was not found.No instability of lumbar spine occurred.

• 所有患者术后X线片显示植骨骨性融合，未发现脊柱假关节形成及内固定松脱、断裂，术后无再发生腰椎不稳定。