Study of the Contribution of Osteopathic Treatment to Classic Medical Management in Patients With Chronic Low Back Pain

The primary objective is to show that the addition of osteopathic treatment to classical medical treatment decreases pain for patients with chronic nonspecific low back pain. This goal will be evaluated at 3 months by comparing * the 3-month change in the level of pain observed in arm 3 (classical medical treatment + osteopathic treatment) versus that observed in arm 1 (classical medical treatment), and * the 3-month change in the level of pain observed in arm 3 (classical medical treatment + osteopathic treatment) versus that observed in arm 2 (classical medical treatment+ sham osteopathic treatment ).