The spinal cord function got better in 21 cases,13 cases improved by 1 grade,7 cases improved by 2 grade,and 1 case improved by 3 grade. According to Mann classification,the lower limb function relief rate was 91.3%(21/23) after operation.

• 术后21例患者脊髓功能不同程度提高；提高1级13例；提高2级7例；提高3级1例；术后改善率为91.；3%25(21/23)。