Table 3 Clinical comparisons between the two groups

VAS

 Preoperative

6(6–7)

6(5–7)

Z =  − 0.319

 Postoperative

2(2–3)*

2(2–2)*

Z =  − 3.123

 1 year Postoperative

2(2–2)*

2(2–2)*

Z =  − 2.630

ODI

 Preoperative

68.75 ± 6.64

67.70 ± 6.50

t =  − 1.282

 Postoperative

23.25 ± 3.50*

22.24 ± 3.55*

t =  − 2.281

 1 year Postoperative

19.64 ± 3.54*

18.58 ± 3.60*

t =  − 2.363

SF-36 bp

 Preoperative

22(14.25–28.38)

21(15–22)

Z =  − 1.059

 Postoperative

84(84–84)*

84(84–84)*

Z =  − 1.274

 1 year Postoperative

84(84–84)*

84(84–84)*

Z =  − 0.421

SF-36rp

 Preoperative

25(25–25)

25(25–25)

Z =  − 0.008

 Postoperative

75(75–75)*

75(75–75)*

Z =  − 0.554

 1 year Postoperative

75(75–75)*

75(75–100)*

Z =  − 0.639