Such Authors value the importance of the arthrosis of the posterior vertebral articulations in the genesis of back pain with or without sciatica. A particular attention must be put on the correct differential diagnosis of the various back pains. They furthermore present their casuistry. The made results through endoarticular injection of steroid and local anesthetic are good. 78% of the subjects has gone back to work; even though this treatment must be considered only one mean to permit a better physical and natural activity.