Measurement Instructions
HOW TO MEASURE CORONAL COBB ANGLES:
STEP 1: Identify the Proximal Thoracic (PT), Main Thoracic (MT), and Thoracolumbar/Lumbar (TL/L) curves and enter them under Coronal Measurements.
- Proximal: Cobb angle formed between a line drawn parallel to the superior end plate of the superior end vertebra and a second line drawn parallel to the inferior end plate of the inferior end vertebra in the proximal thoracic region
- Thoracic: Cobb angle formed between a line drawn parallel to the superior end plate of the superior end vertebra and a second line drawn parallel to the inferior end plate of the inferior end vertebra in the main thoracic region
- Thoracolumbar/Lumbar: Cobb angle formed between a line drawn parallel to the superior end plate of the superior end vertebra and a second line drawn parallel to the inferior end plate of the inferior end vertebra in the thoracolumbar/lumbar region
HOW TO MEASURE CORONAL BENDS:
STEP 2: Identify the Proximal Thoracic, Main Thoracic, and Thoracolumbar/Lumbar bends and enter them under Coronal Measurements.
- Proximal: Cobb angle formed between a line drawn parallel to the superior end plate of the superior end vertebra and a second line drawn parallel to the inferior end plate of the inferior end vertebra in the proximal thoracic region
- Thoracic: Cobb angle formed between a line drawn parallel to the superior end plate of the superior end vertebra and a second line drawn parallel to the inferior end plate of the inferior end vertebra in the main thoracic region
- Thoracolumbar/Lumbar: Cobb angle formed between a line drawn parallel to the superior end plate of the superior end vertebra and a second line drawn parallel to the inferior end plate of the inferior end vertebra in the thoracolumbar/lumbar region
HOW TO MEASURE SAGITTAL PARAMETERS:
STEP 3: Measure sagittal Cobb from T2 to T5, T5 to T12, T10 to L2, and enter the degrees under Sagittal Measurements.
- T2-T5 Proximal Thoracic Kyphosis: Cobb angle measured from the upper (cephalad) endplate of T2 to the lower (caudal) endplate of T5
- T5-T12 Mid/Lower Thoracic Kyphosis: Cobb angle measured from the upper (cephalad) endplate of T5 to the lower (caudal) endplate of T12
- T10-L2 Thoracolumbar Sagittal Alignment: Cobb angle measured from the upper (cephalad) endplate of T10 to the lower (caudal) endplate of L2
HOW TO CHOOSE THE LUMBAR MODIFIER:
STEP 4: Choose a Lumbar Modifier
- A: CSVL passes between the pedicles of the apical lumbar vertebra
- B: CSVL falls between the medial edge of the concave pedicle and the lateral vertebral body on the apical lumbar vertebra
- C: CSVL does not touch the lateral edge of the apical lumbar vertebra
Calculator
After all fields are entered, please click on the link to the calculated Lenke Classification.
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