Haher, T R The effect of the three columns of the spine on the instantaneous axis of rotation in flexion and extension. [electronic resource] - Spine Aug 1991 - S312-8 p. digital Publication Type: Journal Article ISSN: 0362-2436 Subjects--Topical Terms: HumansLumbar Vertebrae--physiologyMovement--physiologyRotationSpine--physiologyWeight-Bearing--physiology