Pelvic incidence is a parameter used to help determine the sagittal balance of the Spine.
Definition
Pelvic incidence is defined as the angle between a perpendicular line originating from the midpoint of the superior endplate of S1 and a line from the femoral head to the midpoint of the superior endplate of S1[^1].
Reference values
In a healthy person, pelvic incidence is approximately 50° and does not change once skeletal maturity has been reached[^2].
