Sagittal vertical alignment

Sagittal vertical alignment (SVA):

Horizontal distance from the posterior edge of the S1 endplate to a plumb line dropped from the mid-C7 VB

Normal < 5 cm.

Alignment objective < 5 cm.

Numbers are positive if plumb line is anterior. May be susceptible to error depending on patient´s stance, resting arms on equipment…

see C2-C7 sagittal vertical axis