In one aspect the invention relates to a bone screw (1 11 21) comprising an external thread (2, 12 22) extending about a longitudinal axis (L) of the screw, and an inner engagement contour (8 18 28) for receiving a complementary engagement contour (211) of a screwdriver (210), wherein in at least a portion of the screw (1 11 21) the thread (2 12 22) is formed by the thread crest (3 13 23) only. In another aspect the invention relates to a suture anchor comprising a bone screw (11 21) and a suture (107 207) affixed to the distal end (16 26) of the screw (11 21). Yet in another aspect the invention relates to a method for fixing a suture anchor in a bone.