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A Bone screw for anchoring a marrow nail with transverse bores in a tubular bone. The bone screw had a thread with a pitch S, a core diameter D1 and outer diameter D3. The screw supports the marrow nail with a middle part and is fixed in the bone with a distal part. The thread has a flat cylindrical

A Bone screw for anchoring a marrow nail with transverse bores in a tubular bone. The bone screw had a thread with a pitch S, a core diameter D1 and outer diameter D3. The screw supports the marrow nail with a middle part and is fixed in the bone with a distal part. The thread has a flat cylindrical thread base with a length l>0.3 S. In addition, a second thread with the same pitch S and with the core diameter D1 is present in a proximal head part, but has a greater outer diameter D2>D3 in order to proximally achieve a fixing with a greater thread profile.

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1. A bone screw for anchoring a marrow nail, and penetrating the marrow nail transversely with a distal part in a suitable transverse bore and supporting the marrow nail with a middle part at the transverse bore, the screw comprising a head part for the application of a turning-in tool, the middle p

1. A bone screw for anchoring a marrow nail, and penetrating the marrow nail transversely with a distal part in a suitable transverse bore and supporting the marrow nail with a middle part at the transverse bore, the screw comprising a head part for the application of a turning-in tool, the middle part and the distal part including a thread having a pitch S, and a core diameter D1 and an outer diameter D3, wherein the thread includes a cylindrical core part having a length l>0.3 S; wherein a proximal portion of the head part includes a proximal thread with the same core diameter D1 and with the same pitch S as the thread distal part, but having an outer diameter D2 that is greater than the outer diameter D3 of the distal part and that is greater than the inner diameter of the transverse bore in the marrow nail; and wherein a reverse-side, proximally directed flank of both threads is on a common helix.