A cement restrictor for plugging a bone canal comprises a main body 4 with ridges which anchor against the medullary surface of the bone, and a plunger 3 connected to a diaphragm 2 said plunger expanding the main body when inserted thererin. The main body may have a female screw thread to which a male screw thread at one end of a solid rod can be fitted, so that in use a pusher 1 telescopically fitting over the solid rod can be used to insert the plunger into the main body. The main body may contain a small metallic ball as an X-ray marker. The cement restrictor may be made of any biocompatible material.
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