Table 1 Preoperative parameters between the patients with CL and CK (n = 50)

Age

16.7 ± 5.6

14.5 ± 2.5

0.059

Sex

/

/

0.256

Males

5

5

Females

11

29

Risser

3.3 ± 2.1

2.9 ± 1.4

0.598

Cobb (°)

54.0 ± 11.9

50.4 ± 9.2

0.259

C2-7 angle (°)^a

−16.0 ± 10.4

12.9 ± 10.1

0.000

TIA (°)^a

76.3 ± 14.2

63.0 ± 7.8

0.002

C2-7 SVA (cm)

1.5 ± 1.2

2.0 ± 0.7

0.136

T1 slope (°)^a

21.3 ± 10.4

8.7 ± 6.9

0.000

PTK (°)^a

13.1 ± 9.3

4.6 ± 8.1

0.002

TK (°)^a

32.5 ± 20.8

20.77 ± 11.8

0.047

LL (°)^a

−62.4 ± 15.3

−49.0 ± 12.6

0.002