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Table 1 The baseline characteristics of the two groups

From: Comparison of low density and high density pedicle screw instrumentation in Lenke 1 adolescent idiopathic scoliosis

Variable

Low implant density

High implant density

(p-Value)

Modifiers (A/B/C)

18/4/6

26/3/5

—

TSP (−1/N/+1)

2/20/6

3/26/5

—

Gender (F/M)

17/11

22/12

—

Age (y)

14.2 ± 2.4

14.8 ± 1.9

0.31

Riser sign

2.5 ± 1.3

2.7 ± 1.1

0.52

MT Cobb (°)

56.5 ± 11.4

52.7 ± 10.1

0.07

convex-Bending Cobb (°)

33.5 ± 10.8

29.4 ± 6.5

0.07

Flexibility (%)

41.2 ± 12.9

45.8 ± 12.2

0.16

VR (Nash-Moe)

1.9 ± 0.7

1.7 ± 0.7

0.28

AVT (mm)

38.2 ± 14.4

34.1 ± 18.2

0.338

TTS (mm)

21.1 ± 15.6

15.7 ± 9.3

0.096

TK (T5–T12)

24.9 ± 11.3

30.9 ± 13.9

0.07

LL (T12–S1)

−52.5 ± 8.1

−55.1 ± 11.3

0.33

PJK(°)

5.4 ± 3.6

6.1 ± 3.0

0.43

  1. TSP thoracic sagittal profile, −1 hypokyphosis, N normal; +1 hyperkyphosis, F female, M male, MT main thoracic, VR vertebral rotation, AVT apical vertebra translation, TTS thoracic trunk shift, TK thoracic kyphosis, LL lumbar lordosis, PJK proximal junctional kyphosis