Fig. 1From: Principal component analysis of the relationship between pelvic inclination and lumbar lordosisSchematic diagram of spinal and pelvis measurements. a Pelvic obliquity, PO; b pelvic inclination angle, PIA; c pelvis rotation, PR; d pelvis torsion, PT; e apical deviation +max, AD+; f apical deviation –max, AD−; g lordotic angle, LABack to article page