The invention relates to an intersomatic cage for intervertebral inclusion and fixing of said vertebrae, provided on its side face with at least one orifice or recess allowing it to be held by the holding clamp; this clamp is provided with hinged arms that can slide relative to one another, their sliding motion being controlled from their rear. The clamp body includes a copying device that reproduces at all times the position of the intersomatic cage as it is held by the clamp, always showing its intervertebral location. The invention is completed by the procedure for placing the intersomatic cages between the vertebrae.