Fifteen patients of group 1 and 12 patients of group 2 were reoperated to take out the internal fixation,and they were defined group A and group B,respectively. We compared JOA score for lumbar function between two groups perioperatively.

• 两种方法分别有15例(定义为A组)和12例(定义为B组)行2次手术取出内固定物,比较AB两组间2次手术前后腰椎功能JOA评分。