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Table 4 Different anchor density groups comparisons

From: The correlations between the anchor density and the curve correction of adolescent idiopathic scoliosis surgery

  Low
AD ≤ 1.4
Middle
1.4 < AD ≤ 1.7
High
AD > 1.7
p value
All patients
 Patients 16 (2M&14F) 73 (7M&66F) 38 (8M&30F)  
 Anchor density 1.31 ± 0.07 1.55 ± 0.08 1.83 ± 0.10 < 0.001
 Fused level 10.6 ± 2.1 10.5 ± 2.1 8.4 ± 1.7 < 0.001
 Flexibility (%) 32.0 ± 12.6 35.5 ± 20.8 38.9 ± 18.4 0.45
 Correction rate (%) 64.3 ± 9.8 64.1 ± 9.5 63.9 ± 11.3 0.99
 Correction index 2.5 ± 1.8 3.8 ± 6.5 2.4 ± 2.4 0.36
 TK correction -1.9° ± 8.8° 3.9° ± 9.7° 7.3° ± 9.1° 0.005
 LL correction 2.4° ± 13.3° 2.5° ± 9.8° 2.1° ± 12.3° 0.99
 AVR correction 0.7 ± 0.6 0.9 ± 0.6 0.8 ± 0.7 0.60
 AVT correction (mm) 29.2 ± 13.2 25.7 ± 11.4 26.5 ± 11.9 0.57
Lenke 1-3
 Patients 16 (2M&14F) 54 (5M&49F) 20 (4M&16F)  
 Anchor density 1.31 ± 0.07 1.54 ± 0.07 1.84 ± 0.10 < 0.001
 Fused level 10.6 ± 2.1 10.4 ± 2.0 8.5 ± 0.9 < 0.001
 Flexibility (%) 32.0 ± 12.6 33.2 ± 18.7 30.9 ± 16.0 0.88
 Correction rate (%) 64.3 ± 9.8 62.4 ± 9.1 62.8 ± 9.1 0.77
 Correction index 2.5 ± 1.8 3.7 ± 6.5 3.1 ± 3.1 0.73
 TK correction -1.9° ± 8.8° 4.1° ± 9.6° 6.9° ± 6.5° 0.01
 LL correction 2.4° ± 13.3° 3.5° ± 10.6° -0.5° ± 11.9° 0.42
 AVR correction 0.7 ± 0.6 0.8 ± 0.5 0.6 ± 0.5 0.19
 AVT correction (mm) 29.2 ± 13.2 24.7 ± 11.2 21.9 ± 11.6 0.18
Lenke 1
 Patients 10 (1M&9F) 31 (3M&28F) 18 (3M&15F)  
 Anchor density 1.33 ± 0.06 1.53 ± 0.07 1.82 ± 0.09 < 0.001
 Fused level 9.2 ± 0.9 9.1 ± 1.2 8.3 ± 0.8 0.03
 Flexibility (%) 33.3 ± 13.6 39.1 ± 19.4 32.3 ± 15.5 0.37
 Correction rate (%) 66.5 ± 9.2 62.6 ± 10.2 63.7 ± 8.1 0.53
 Correction index 2.5 ± 1.8 3.4 ± 7.8 2.5 ± 1.4 0.85
 TK correction -3.6° ± 9.1° 6.6° ± 10.5° 7.0° ± 6.4° 0.008
 LL correction -2.3° ± 9.7° 4.8° ± 10.2° -1.7° ± 11.9° 0.06
 AVR correction 0.8 ± 0.6 0.8 ± 0.5 0.6 ± 0.5 0.24
 AVT correction (mm) 27.8 ± 12.0 25.0 ± 10.4 22.9 ± 109 0.52
  1. Data are presented as mean ± standard deviation (SD)
  2. AD anchor density, TK thoracic kyphosis, LL lumbar lordosis, AVR apical vertebral rotation, AVT apical vertebral translation