Locking nail intramedullary a bone screw, to address bone fractures, wherein the locking nail (10) in spaced zones, respectively at least one transverse hole for receiving a bone screw, being configured at least one cross hole as a slot which extends in the axial direction, characterized in that an end section of the slot (12) has a width greater than a next section of the oblong hole (12), the next section of constant width along its length and being shaped the bone screw (20, 22) in its cross-sectional contour and the final section such that the bone screw is locked in the final stretch in a first rotational position and in a second rotational position, can pass freely the final section to the next section.
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