Abstract: An internal fixation device for securing two adjacent fractures bone parts together comprises a tubular member which is adapted to be driven into the two fractured bone parts. The tubular member has a plurality of circumferentially arranged and longitudinally extending slots therein at two longitudinally spaced locations which would normally be aligned with the respective bone joints. A shaft member is engaged in the tubular member and has a threaded portion in the vicinity of each set of slots. A nut member is engaged on the threaded portion adjacent each slot and has a fin part which extends through the slot and is engageable with the bone part. To facilitate the outward movement of the fins which are carried on a cylindrical bushing so as to extend axially outwardly from one end a spring is positioned around the rod and a cam member in the form of a cylindrical bushing is disposed between each end of the spring and an associated internally threaded bushing which carries the fins.