Abstract: An intramedullary device for use in internal fixation of a fracture transverse to the longitudinal axis of a long bone which includes a substantially rigid center rod having a plurality of longitudinal slots extending along the length thereof. One of a plurality of generally flexible outer rods is received and retained within one of the longitudinal slots and thereby extend outwardly from the center rod. Each outer rod has a retention section angulated from the longitudinal axis of the long bone which penetrates through and is retained by the cancellous bone thereby stabilizing the fracture at the distal and proximal ends of the long bone. In order to install the intramedullary device within the endosteal canal, each end of the generally flexible outer rods are coupled to one of a plurality of extension rods of an installation device. The generally rigid center rod is introduced through the central opening of the installation device and thus extends into the endosteal canal.