The lumbar spine lateral view image of a patient without any underlying disease was used to demonstrate how the segmental lordotic angle and disc height were measured. Segmental lordotic angle (SLA) is defined as the angle subtended by the superior endplate line of upper vertebral body and the lower endplate of lower vertebral body. Disc Height (DH) is defined as the distance from mid-position of upper endplate to lower endplate of two vertebral body.