Lenke 5

Type 5 curves have structural thoracolumbar/lumbar curve while the main thoracic and the proximal thoracic curves are non-structural.

Due to the morphology of type 5 curves lumbar modifiers A and B do not exist.

A minor curve is defined as structural if at least one of the two below criteria are met:

• Residual curve greater than or equal to 25 ° on supine bending radiograph
• T2 – T5, T10-L2 kyphosis greater than or equal to 20 ° (regardless of coronal flexibility)

The left X-rays show a 15 year old female with Lenke 5C curve consisting of a:

• No PT curve
• 25° minor MT curve, correcting to 16° on side bending
• 53° major TL/L curve, correcting to 11° on side bending

The MT curves is non-structural.

The lumbar modifier is determined by drawing a vertical line from the center of the sacrum.

The sagittal modifiers are determined from the lateral radiograph from T5-T12. A measurement less than 10° is designated as "-".

Measurements between 10°-40° is designated as "N".

A measurement larger than 40° is designated as "+".