Abstract: A locked intramedullary nail suitable for treating fractures of the femur, including a pin provided with proximal and distal holes for the passage of locking screws, and further including coaxial tubular elements of greater diameter than the pin, the first of which is mounted from the proximal end on the pin and is provided with restraining means which prevent its rotation about the pin but which enable it to translate along its axis as far as a stop, the first element comprising an upper thread and holes for the passage of the proximal locking screws, between the thread and said holes it being to a certain extent elastically yieldable in the manner of a spring by the effect of spiral slits provided through its lateral surface, the second of the coaxial tubular elements being mounted on said first element and engaging it via a thread of opposite hand to that of the first element, while at the same time engaging the proximal end of the pin by screwing, so that while said second element screws onto the pin it u

Abstract: A lockable intramedullary nail, suitable for treating fractures of the humerus, including a pin provided in the proximal region with a slot and with an abutment for a spring to be mounted about the pin. On the spring there acts a suitable structure for adjusting compression of the spring, including a sleeve provided with a through hole for the proximal locking of the nail, the hole being able to translate along the pin in a position facing the slot.