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M. Cles:-radiographie, . Mesure-de-hauteur-discale, . Rachis-lombaire, . Reproductibilité, and E. Balayage-biplan, ABSTRACT________________________________________________________________________________________ Background context: Chronic low-back pain (LBP) is a major public health problem Conventional radiography (CR) of Lumbar Spine is the first imaging technique recommended for LBP, particularly to assess discal height (DH) measurement. No study assessed DH measurement with Low-Dose Biplanar radiographic System (LDBS) Purpose: To compare lumbar DH measurements between CR and a LDBS on vertebras ex-vivo and in-vivo in a chronic LBP population. Patient sample: Patient sample included consecutively and prospectively those diagnosed in our institution with chronic LBP from, 2011.