Abstract: A method and apparatus for measuring pelvic symmetry to aid in diagnosing and treating lower back pain. A first angle is measured between the horizon and a axis extending between a left ASIS and a left PSIS and simultaneously compared against a second angle corresponding to the angle between the horizon and an axis extending between a right ASIS and a right PSIS. The angle of a line extending through points bisecting each of the axis and the horizon is also measured. The angles are then compared against prior measurements or norms to assess posture and pelvic position in order to document progress of lower back pain treatment.