Abstract: An intramedullary nail has a tip portion provided with means for engaging a bolt previously inserted into a bone transverse to the bone axis.

Abstract: A intramedullary nail of the type adapted to receive a conical drive connection is provided with a slot which extends from the tip to the head for improved elasticity. A locking section is provided at the head to avoid the nail spreading apart when a conical drive connection is used. The nail has a threaded conical socket to receive a drive connection and the thread is shaped to minimize radial forces resulting from driving bolt being screwed into the socket.

Abstract: A surgical compression plate is provided which is designed to permit the insertion of bone screws at angles up to 45.degree.. A drill guide capable of tilting to various angles, for use in connection with the novel plate is also disclosed.

Abstract: A plate is provided with clearance holes and fastening screws. Each screw is provided in the region of its head with a clamping part subdivided into tongues by means of slots and provided with an internal opening bounded by a conical surface. To each screw belongs an expander having a conical outer surface. The expander is axially displaceable in relation to the clamping part to force the tongues of the clamping part apart and lock the screw in relation to the plate. A rigid connection between the plate and the screws is thus provided, even if reabsorption of bone material takes place at the bearing surface of the plate.