Anterior Approach (n = 97)

Posterior Approach (n = 48)

p

Strength (<3)

n (%)

n (%)

Presurgical

Immediate postsurgical

Postsurgical 3 months

Postsurgical 6 months

Postsurgical 1 year

21 (21.6)

5 (5.2)

3 (3.2)

3 (3.2)

3 (3.2)

22 (45.8)

7 (14.6)

7 (14.6)

2 (4.3)

3 (6.3)

0.003*

0.055

0.011*

0.757

0.384

p

<0.001*

<0.001*

Sensitivity (affected)

n (%)

n (%)

Presurgical

Immediate postsurgical

Postsurgical 3 months

Postsurgical 6 months

Postsurgical 1 year

66 (68)

53 (54.6)

31 (32)

26 (26.8)

22 (22.7)

37 (77.1)

32 (66.7)

26 (54.2)

28 (58.3)

24 (50)

0.259

0.166

0.010*

0.001*

0.001*

p

<0.001*

0.005*

NDI †

Index (range) %

Index (range) %

Presurgical

Immediate postsurgical

Postsurgical 3 months

Postsurgical 6 months

Postsurgical 1 year

30 (10 - 48)

12 (0 - 30)

5 (0 - 11)

2 (0 - 10)

0 (0 - 5)

24 (2.5 - 45)

12.5 (0 - 40)

7.5 (0 - 24.5)

0 (0 - 15)

0 (0 - 10)

0.225

0.923

0.422

0.765

0.394

p

<0.001*

<0.001*

Nurick (≧3)

n (%)

n (%)

Presurgical

Immediate postsurgical

Postsurgical 3 months

Postsurgical 6 months

Postsurgical 1 year

26 (26.8)

27 (27.8)

27 (27.8)

18 (18.6)

12 (12.4)

24 (50)

25 (52.1)

25 (52.1)

17 (35.4)

16 (33.3)

0.006*

0.004*

0.004*

0.026*

0.003*

p

<0.001*

<0.001*