Table 4 Comparison of evaluated parameters variable according to the postoperative loss of CL

Age (y)

62.34 ± 10.49

66.47 ± 7.32

61.41 ± 10.29

p > 0.05

Follow-up period (months)

18.77 ± 7.51

20.88 ± 9.54

20.71 ± 11.03

p > 0.05

Surgery segment

3.89 ± 0.72

3.53 ± 0.64

3.82 ± 0.73

p > 0.05

Proximal level (C3)

28/47

9/15

12/17

p > 0.05

Pre CL (°)

15.92 ± 9.63^*

16.93 ± 10.49

23.31 ± 11.42^*

p  < 0.05

Pre T1S (°)

28.59 ± 6.65

28.79 ± 8.58

31.95 ± 8.28

p > 0.05

Pre cSVA (mm)

24.62 ± 13.33

20.44 ± 9.57

17.11 ± 11.86

p > 0.05

T1S-CL (°)

12.92 ± 8.01

11.85 ± 7.58

9.65 ± 10.09

p > 0.05

Flex CL (°)

-14.95 ± 8.32

-16.76 ± 8.19

-15.08 ± 10.87

p > 0.05

Ext CL (°)

27.37 ± 11.73

24.45 ± 11.32

27.19 ± 12.14

p > 0.05

Post CL (°)

15.29 ± 9.69^@

9.40 ± 11.49

6.48 ± 13.52^@

p  < 0.01

Total ROM (°)

42.32 ± 12.98

41.20 ± 8.64

42.27 ± 14.86

p > 0.05

Flex ROM (°)

30.63 ± 11.43^*

33.69 ± 9.80

37.39 ± 14.40^*

p  < 0.05

Ext ROM (°)

11.69 ± 5.99^*@

7.51 ± 5.66^*

4.88 ± 4.00^@

p  < 0.05

EXR (%)

28.25 ± 14.58^@

20.65 ± 13.98

11.79 ± 9.22^@

p  < 0.01

Pre JOA

12.43 ± 2.88

12.87 ± 1.73

13.13 ± 1.00

p > 0.05

Post JOA

15.57 ± 1.13

14.86 ± 1.19

14.50 ± 1.01

p > 0.05

JOA recovery rate (%)

69.23 ± 20.34^@

48.18. ± 30.54

35.40 ± 25.01^@

p  < 0.01