Table 1. Commonly used cervical spine sagittal alignment parameters.

Parameter	Description
C0–C2 lordosis	Angle between foramen magnum and inferior end plate of C2
C2–C7 lordosis	Cobb method: Angle between lines drawn tangential to inferior end plates of C2 and C7
	Harrison posterior tangent method: Lines drawn tangential to the posterior borders of the C2 and C7 vertebral bodies. Angle between lines drawn perpendicular to these
C2–C7 sagittal vertical axis	Horizontal distance between vertical line from centre of C2 vertebral body and the posterosuperior corner of C7
Chin-brow vertical angle (CBVA)	Angle between line drawn from chin to forehead (most prominent parts) and vertical line
T1 slope	Angle between line tangential to superior endplate of T1 and horizontal line