The invention relates to a facet arthroplasty device comprising connecting rods (2) connecting, thereinbetween, connectors (3, 6) respectively held in the vertebral bodies of each vertebra V instrumented by means of anchoring screws (4), while each connector (3) comprises means for immobilising and guiding a socket (5) providing the connector (3) with freedom of movement in rotation R, R1 and/or lateral pivoting (B) about a vertical axis xx and/or w of the anchoring screw (4) that has been previously fixed in the corresponding vertebral body.
