The invention concerns a device comprising an implant (18) designed to be inserted at least partially between the vertebral bodies (4, 4′) of two neighboring vertebrae, said implant (18) being adapted to provide to said neighboring vertebral bodies (4, 4′) at least one degree of mutual freedom, said device further comprising at least an extra-discal member (20), arranged behind the intervertebral space (12), adapted to damp a movement between said vertebrae (2, 2′), at least in the intervertebral flexion direction.