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Table 2 measurement methods of each parameter

From: Cervical sagittal parameters were closely related to Neck Disability Index score after anterior cervical decompression and fusion

 

Definition of all parameters used: parameters description

C2–C7 lordosis

Angle between the lower plate of C2 and the lower plate of C7

C2–C7 SVA

The distance from the posterior, superior corner of C7 to the plumb-line from the centroid of C2

T1 slope

Angle between a horizontal line and the superior endplate of T1

TS–CL

Mismatch between T1 slope and CL

Thoracic inlet angle

Angle formed by a line perpendicular to the superior endplate of T1 and a line connecting the centre of the T1 upper endplate and the upper end of the sternum

Neck tilt

Angle formed by the reference vertical line drawn in the upper end of the sternum and a line connecting the centre of the T1 upper end plate and the upper end of the sternum

Spine-cranial angle

The angle is defined between the C7 slope and the straight line joining the middle of the C7 end plate and the middle of the sella turcica