Intramedullary nail with adapted cross sections.

This tibial intramedullary nail for the treatment of tibial fractures of all indications has an anterior half (1), a posterior half (2), a proximal end portion (3) and a distal end portion (4), wherein the longitudinal axes (5; 6) of the two end parts (3, 4) form an angle of 9 ° with each other in the anterior-posterior plane. In this case, the proximal end part (3) has a cross-sectional area (7), which both in the anterior (1), as well as the posterior (2) half is formed trigonal and in its entirety is approximately square, whereas the distal end portion (4) a cross-sectional area (8) which is approximately trigonal and in the posterior half (2) is approximately semi-spherical in the anterior half (1). The special design of the inventive intramedullary nail the one hand causes a high rotational stability in the proximal, spongy part of the tibia and the other hand, an optimal adaptation to the geometry of Markraumhöhlung the distal cortical portion of the tibia.