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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