Vertebral fixation device (1) for the maintenance of a spinal vertebra (2) on a stem (3, 51), comprising said stem that extends around an axis, a body (6) for fixing on the stem (3 , 51) of a U-shaped or substantially U-shaped cross-section having a first branch (9), a bottom (10) and a second branch (11), each branch comprising a recess (20, 21), the recesses being emptied located opposite each other by the bottom side (10) to define a passage substantially perpendicular to the rod, a flexible band (26) connecting a part of said vertebra with the fixing body (6), said band forming a loop (25) by approaching its two end portions (26 ', 26 ") inserted in said recesses facing the bottom side, which define a plane of extension of the loop perpendicular to the axis of the rod in rest position, and means (27) body lock on the rod (3, 51) and the band (26) flexible on the fixing body (6) through the stem (3, 51), characterized in that the body is provided with a rigid anchor hook, because said hook is integral with one of the branches of the U on the other side of the body with respect to the bottom, it is parallel to the rod, it is located completely at a distance from the passage of the band defined by the emptyings on the other side of the plane parallel to said passage of the band, defined by the axis of the rod , with respect to the passage formed by the recesses, and by which said hook is arranged to become embedded on the part of the vertebra in the immediate proximity of the flexible band (26) when it is in a locked position on said part of the vertebra.Dispositivo (1) de fijación vertebral para el mantenimiento de una vértebra raquídea (2) sobre un vástago (3, 51), que comprende dicho vástago que se extiende alrededor de un eje, un cuerpo (6) de fijación sobre el vástago (3, 51) de sección transversal en U o sustancialmente en forma de U que presenta una primera rama (9), un fondo (10) y una segunda rama (11), comprendiendo cada rama un vaciado (20, 21), estando
