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Table 2 Comparing coronal parameters between final coronal balance and imbalance Lenke 5 AIS patients (n = 56)

From: Coronal and sagittal balance in Lenke 5 AIS patients following posterior fusion: important role of the lowest instrument vertebrae selection

  Imbalance (n = 7) Balance P1 P2
All (n = 49) LIV = L5 (n = 14)
Age (ys) 15.0 ± 2.7 15.2 ± 2.0 15.8 ± 2.5 0.829 0.531
Risser Sign (°) 2.6 ± 1.8 3.5 ± 1.3 3.9 ± 1.4 0.224 0.113
Gender     0.673 0.525
 Female 5 31 8   
 Male 2 18 6   
ML Cobb
 Pre-op(°) 55.5 ± 12.5 52.6 ± 7.7 55.6 ± 9.1 0.392 0.986
 Last (°) 4.1 ± 5.0 7.2 ± 6.9 8.0 ± 9.1 0.249 0.301
 CR (%) 93.5 ± 8.3 86.4 ± 12.2 86.5 ± 13.0 0.143 0.211
C7-CSVL (mm)
 Pre-op 19.9 ± 19.6 13.7 ± 17.5 14.0 ± 13.6 0.394 0.426
 Lasta 23.9 ± 25.5 6.1 ± 9.3 8.0 ± 7.5 0.001 0.04
Pre-op LEV Tilt (°) 32.1 ± 6.5 30.3 ± 6.2 28.6 ± 5.2 0.112 0.544
Pre-op LEV Trans (mm) 32.5 ± 8.2 26.2 ± 8.4 26.6 ± 8.1 0.096 0.134
Pre-op LIV tilt (°) 11.4 ± 4.1 21.7 ± 7.4a 14.2 ± 5.5 0.001 0.252
Pre-op LIV Trans (mm) 5.2 ± 1.8 15.7 ± 11.6a 5.0 ± 2.1 0.022 0.812
Pre-op Hemi-LS (°)
 Neutral 27.9 ± 6.1 23.8 ± 6.8 25.7 ± 8.0 0.142 0.519
 Reducea 15.3 ± 4.8 6.3 ± 6.3 7.5 ± 6.3 0.001 0.009
LIV (n)a   0.008 /
 L3 0 12 /   
 L4 0 23 /   
 L5 7 14 14   
  1. P1 means the p value of imbalance vs. All balance patients; P2 means the p value of imbalance vs. Balance with LIV = L5 group
  2. ML main lumbar curve, Op operation, Trans translation, Hemi-LS lumbosacral Hemi-curve
  3. ameans significant different