Table 3 Functional status

Pre-operation

VAS

7.7 ± 0.2

7.9 ± 0.1

0.573

Karnofsky score

56.8 ± 1.7

58.7 ± 1.7

0.458

Ambulatory status

 Nonambulatory

9

3

<0.001

 Ambulatory (assistant)

10

3

 Ambulatory

0

9

AIS

 C

1

0

0.215

 D

2

2

 E

1

5

Post-operation improvement

VAS

2.9 ± 0.2

2.9 ± 0.4

0.927

Karnofsky score

61.6 ± 1.4

64.8 ± 4.8

0.485

Ambulatory status

 Improve

14

5

0.036

 Same

5

10

 Aggravate

0

0

AIS

 Improve

1

5

0.242

 Same

3

2

 Aggravate

0

0