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Table 1 Demographic Characteristics and Operative Data

From: Perioperative outcome and complications following single-staged Posterior Spinal Fusion (PSF) using pedicle screw instrumentation in Adolescent Idiopathic Scoliosis (AIS): a review of 1057 cases from a single centre

Demographics Age 10–18 Age 19–30 Total p-value
Sex, n (%)
 Male 110 (10.4) 30 (2.8) 140 (13.2) 0.09
 Female 773 (73.1) 144 (13.6) 917 (86.8)
Age (year) 14.3 ± 1.9 22.5 ± 3.2 15.6 ± 3.7 < 0.01
Menarche age (year) 12.3 ± 1.2 12.8 ± 1.2 12.4 ± 1.2 < 0.01
Distribution by Lenke type, n (%)
 1 413 (39.0) 83 (7.9) 496 (46.9) 0.48
 2 189 (17.9) 38 (3.6) 227 (21.5)
 3 23 (2.2) 8 (0.8) 31 (2.9)
 4 27 (2.6) 3 (0.3) 30 (2.8)
 5 159 (15.0) 25 (2.4) 184 (17.4)
 6 72 (6.8) 17 (1.6) 89 (8.4)
Height (cm) 156.4 ± 7.7 160.0 ± 8.1 157.0 ± 7.8 < 0.01
Weight (kg) 45.2 ± 8.8 50.0 ± 9.1 46.0 ± 9.0 < 0.01
Body mass index (kg/m2) 18.4 ± 3.1 19.5 ± 3.4 18.6 ± 3.2 < 0.01
Body surface area (m2) 1.4 ± 0.2 1.5 ± 0.2 1.4 ± 0.2 < 0.01
Preoperative haemoglobin (g/dL) 13.7 ± 1.2 13.6 ± 1.4 13.7 ± 1.2 0.10
Preoperative major curve Cobb angle (°) 66.7 ± 17.3 65.4 ± 16.5 66.5 ± 17.1 0.36
Risser sign, n (%) 3.3 ± 1.5 4.9 ± 0.6 3.6 ± 1.5 < 0.01
 0 73 (8.3) 0 73 (6.9)  
 1 49 (5.5) 0 49 (4.6)  
 2 120 (13.6) 0 120 (11.4)  
 3 102 (11.6) 0 102 (9.6)  
 4 395 (44.7) 12 (6.9) 407 (38.5)  
 5 144 (16.3) 162 (93.1) 306 (28.9)  
Operative Data
 Number of screws 14.1 ± 2.3 14.3 ± 2.4 14.1 ± 2.4 0.33
 Number of levels fused 10.3 ± 2.2 10.3 ± 2.1 10.3 ± 2.2 0.84
 Proximal level of fusion, median T3 T3 T3
 Distal level of fusion, median L3 L2 L2
 Screw density (screws/vertebral level) 1.27 ± 0.20 1.29 ± 0.24 1.27 ± 0.21 0.20
 Duration of surgery (min) 143.9 ± 48.4 161.1 ± 52.0 146.8 ± 49.4 < 0.01
 Postoperative haemoglobin (g/dL) 10.9 ± 1.5 10.9 ± 1.6 10.9 ± 1.5 0.96
 Total blood loss (mL) 945.4 ± 535.7 990.5 ± 502.5 952.9 ± 530.4 0.31
 Estimated blood volume (mL) 3103.0 ± 499.7 3376.1 ± 539.0 3148.0 ± 516.1 < 0.01
 Total blood loss/estimated blood volume (%) 30.8 ± 17.4 29.9 ± 15.9 30.7 ± 17.1 0.51
 Allogeneic blood transfusion n (%) 46 (4.3) 7 (0.7) 53 (5.0) 0.51
 Length of stay (days) 3.4 ± 0.9 3.6 ± 1.2 3.5 ± 0.9 0.12
 Estimated blood salvage (ml) 485.6 ± 305.6 505.5 ± 297.7 488.9 ± 304.3 0.43