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Table 2 Stratification based on the change on lumbar lordosis (LL), thoracic kyphosis (TK) and sagittal vertical axis (SVA)

From: Cervical spine alignment following surgery for adolescent idiopathic scoliosis (AIS): a pre-to-post analysis of 81 patients

Stratification based on the change in LL, TK and SVA

Thoracic Kyphosis (TK)

 Increase: ΔTK < −5°

Stable: ΔTK = [− 5°; 5°]

Decrease: ΔTK > 5°

Sagittal Vertical Axis (SVA)

 Increase: ΔSVA> 25 mm

Stable: ΔSVA = [− 25 mm; 25 mm]

Decrease: ΔSVA<− 25 mm

  1. TK thoracic kyphosis, SVA sagittal vertical axis, Δ = parameter change pre- to-post-operatively
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BMC Surgery

ISSN: 1471-2482

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