The management of chronic low back pain is now part of a multi-disciplinary set of proposals with the aim of adapting for each patient orientations of both medicated and non-medicated care. Very classically, analgesic treatment of stage I or II is of use, reinforced by the occasional use of NSAIDs in the absence of contraindication. In this medical attempt of the control of the pain associates a physical care (supervised exercises, physiotherapy care), cognitive and behavioral therapy, multidisciplinary care. Osteopathic treatment is a specific manual diagnostic and therapeutic procedure. This study aims to evaluate the relevance of providing osteopathic treatment in combination with classical medical treatment in the management of patients with chronic non-specific low back pain.