Lenke Classification (Adolescent Idiopathic Scoliosis)
Lenke classification of adolescent idiopathic scoliosis derives the curve type 1 to 6 from which regional curves are structural.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Proximal thoracic Cobb angle, standing
- 22
- Main thoracic Cobb angle, standing
- 58
- Thoracolumbar/lumbar Cobb angle, standing
- 62
- Proximal thoracic Cobb angle on side bending
- 12
- Main thoracic Cobb angle on side bending
- 30
- Thoracolumbar/lumbar Cobb angle on side bending
- 38
- T2 to T5 kyphosis
- 8
- T10 to L2 kyphosis
- 6
- T5 to T12 kyphosis
- 15
- Center sacral vertical line at the lumbar apex
- CSVL falls completely medial to the apical body, touching neither
Result: Lenke 3CN: a type 3, because the lumbar curve leads the thoracic one by only 4 degrees.
The tool opens with these values already filled in. Replace them with your own.
What you enter
- Proximal thoracic Cobb angle, standing (degrees)
- Main thoracic Cobb angle, standing (degrees)
- Thoracolumbar/lumbar Cobb angle, standing (degrees)
- Proximal thoracic Cobb angle on side bending (degrees)
- Main thoracic Cobb angle on side bending (degrees)
- Thoracolumbar/lumbar Cobb angle on side bending (degrees)
- T2 to T5 kyphosis (degrees)
- T10 to L2 kyphosis (degrees)
- T5 to T12 kyphosis (degrees)
- Center sacral vertical line at the lumbar apex
How this is calculated
Lenke LG, Betz RR, Harms J, Bridwell KH, Clements DH, Lowe TG, Blanke K. Adolescent idiopathic scoliosis: a new classification to determine extent of spinal arthrodesis. J Bone Joint Surg Am. 2001;83(8):1169-1181. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.