Fig. 2From: Coronal and sagittal spinopelvic alignment in the patients with unilateral developmental dysplasia of the hip: a prospective studyThe diagram for the measurement of PI, PT and SS. (PI pelvic incidence, angle between a line perpendicular to the sacral end plate and a line joining the middle of the sacral plate and hip axis, PT pelvic tilt, between the vertical line and a line joining the middle of the sacral end plate and hip axis, SS sacral slope, angle between the sacral end plate and the horizontal line.)Back to article page