Orthopaedic bone cement is used throughout the world to secure hip, knee and other metallic prostheses in an appropriate medical position. Also, bone cement can be used to replace and/or repair damaged bone, such as a bone void filling and spinal column with degenerative intervertebral discs by permanently stabilising adjacent vertabrae by fusion. Cement may be applied by hand or may be put into a syringe and applied separately. However, this simple mixing has two major drawbacks. Firstly, free methylmethacrylate fumes are emitted from the mixture. Secondly, a very high mixing efficiency is required to produce a homogenous cement material. The specification discloses a device for mixing bone cement material. The device has a mixing body with a chamber, a first end, and a second end. The device has a lid arranged to be fitted to the first end. The device also has means for mixing bone cement material in the chamber, the means for mixing comprising a rod extending through the lid and into the chamber. The device also has means for dispensing bone cement material from said mixing body attached to a second end of the mixing body. The means for dispensing the bone cement material is a plunger movable by the application of force through the chamber. The plunger is provided to set an adjustable volume in the chamber prior to mixing. The device also has means for positioning the plunger between the first and the second end of the mixing body to define a volume of the chamber, and means for maintaining the position of the plunger so as to maintain the volume of the chamber during mixing. The means for positioning the plunger and means for maintaining the position of the plunger comprises a screw thread arranged on an outer surface of the plunger, and a nut having a screw thread to be received by the screw thread arranged on the outer surface of the plunger. The nut also has a recess having a screw thread to be received by a screw thread located at the second end of the mixin
