A device for bone cement Z , comprising: a cylindrical container including a proximal end , a distal end , a chamber extending along a longitudinal axis from the proximal end to the distal end thereof, and an injection passage disposed at the distal end of the cylindrical container , wherein the injection passage has an inner diameter that is less than a diameter of the chamber ; a plug removably disposable in the injection passage ; a mixing screw rotatably disposable in the chamber , the mixing screw including a proximal end , a distal end , a screw thread extending along an outer surface of the mixing screw from proximate the proximal end to proximate the distal end of the mixing screw , and a return passage extending through the mixing screw from the proximal end to the distal end thereof; a mixing rod that is selectively engageable with the proximal end of the mixing screw , wherein, in a mixing mode of the device , the mixing rod engages and rotates the mixing screw about the longitudinal axis causing material disposed in the chamber to be moved distally through the chamber by the screw thread and return to the proximal end of the chamber through the return passage of the mixing screw ; and an injection rod that is selectively engageable with the mixing screw and extendable through the return passage to a point proximate the distal end of the mixing screw , wherein, in an injection mode of the device, the plug is removed from the injection passage , the injection rod occludes the return passage of the mixing screw , and the injection rod is engaged with and rotates the mixing screw about the longitudinal axis causing material disposed in the chamber to be moved distally through the chamber and through the injection passage . a cylindrical container including a proximal end , a distal end , a chamber extending along a longitudinal axis from the proximal end to the distal end thereof, and an injection passage disposed at the distal end of the cylindrical container , wherein the injection passage has an inner diameter that is less than a diameter of the chamber ; a plug removably disposable in the injection passage ; a mixing screw rotatably disposable in the chamber , the mixing screw including a proximal end , a distal end , a screw thread extending along an outer surface of the mixing screw from proximate the proximal end to proximate the distal end of the mixing screw , and a return passage extending through the mixing screw from the proximal end to the distal end thereof; a mixing rod that is selectively engageable with the proximal end of the mixing screw , wherein, in a mixing mode of the device , the mixing rod engages and rotates the mixing screw about the longitudinal axis causing material disposed in the chamber to be moved distally through the chamber by the screw thread and return to the proximal end of the chamber through the return passage of the mixing screw ; and an injection rod that is selectively engageable with the mixing screw and extendable through the return passage to a point proximate the distal end of the mixing screw , wherein, in an injection mode of the device, the plug is removed from the injection passage , the injection rod occludes the return passage of the mixing screw , and the injection rod is engaged with and rotates the mixing screw about the longitudinal axis causing material disposed in the chamber to be moved distally through the chamber and through the injection passage . <EOS>