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Insights into Imaging

Table 2 Lenke classification system

From: Idiopathic scoliosis in children and adolescents: assessment with a biplanar X-ray device

Curve type

Lumbar spine modifiera

Sagittal thoracic modifierb

Type 1

main thoracic

A

–

Type 2

double thoracic

Type 3

double major

B

N

Type 4

triple major

Type 5

thoracolumbar/lumbar

C

+

Type 6

thoracolumbar/lumbar main thoracic

  1. aLumbar spine modifier is assigned on the basis of the relation between the lumbar apical vertebra and the centre sacral vertical line (CSVL): A if the CSVL lies between the pedicles of the apical vertebra; B if the CSVL touches the apical vertebral body and C if the CSVL lies completely medial to the apical vertebral body
  2. bSagittal thoracic modifier is assigned on the basis of the sagittal alignment from T5 to T12: – if the angle of kyphosis is less than 10°; N if the angle of kyphosis is 10–40°; + if the angle of kyphosis is greater than 40°
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