Table 2 Comparisons of pre- and postoperative radiological and neurological evaluation between the two groups

 Before operation

6.3 ± 2.3

5.7 ± 1.9

.31

 At discharge

1.9 ± 1.1

2.9 ± 1.2

<.01

 3-month follow-up

1.9 ± 1.1

2.9 ± 1.2

<.01

 Before operation

11.1 ± 3.5

10.2 ± 4.8

.43

 At discharge

1.0 ± 1.8

3.0 ± 3.1

< .01

 3-month follow-up

1.0 ± 1.8

3.0 ± 3.1

< .01

 Before operation

122.1 ± 14.7

123.1 ± 18.0

.82

 At discharge

151.5 ± 10.2

139.5 ± 17.2

< .01

 3-month follow-up

151.8 ± 10.1

139.6 ± 17.2

< .01

 Before operation

125.4 ± 10.9

130.1 ± 16.4

.20

 At discharge

156.4 ± 7.1

145.0 ± 14.2

<.01

 3-month follow-up

157.0 ± 6.9

145.3 ± 14.3

<.01

 Before operation

10.7 ± 1.5

11.1 ± 1.3

.34

 At discharge

12.6 ± 1.3

12.0 ± 1.0

.06

 3-month follow-up

13.8 ± 1.0

13.0 ± 0.9

<.01

 6-month follow-up

14.3 ± 0.8

13.7 ± 0.6

<.01

 12-month follow-up

15.4 ± 1.00

14.5 ± 0.9

<.01

 3-month follow-up

22 (62.9%)

7 (33.3%)

.03

 6-month follow-up

30 (85.7%)

13 (61.9%)

.04

 12-month follow-up

35 (100%)

20 (95.2%)

.36

 Final follow-up

35 (100%)

21 (100%)

NS