positioned within bore 38 such that the rear threaded segment 7 of bone screw 1 can fully engage the internal threads 40 compression sleeve 30 may be used in a substantially similar manner as implantation instrument 15 discussed supra fig4 a 4b show an embodiment of a screwdriver 50 for use with a bone screw 1 as seen in the side view of fig4 a screwdriver 50 may have an engaging end 52 a trailing end 54 and indicia 56 a 56 b 56 c screwdriver 50 may also have a depressed section 58 at or near the trailing end 54 which may aid in engaging a handle as seen in the cross sectional view of fig4 b screwdriver 50 may have a bore 60 running between a leading opening 62 and a trailing opening 64 screwdriver may also have an engaging portion 66 for engaging a bone screw 1 in a similar manner to that described supra in relation to screwdriver 16 engaging portion 66 may be of any chosen shape to effectively engage a bone screw 1 indicia 56 a 56 b 56 c may aid in determining the depth of insertion of a bone screw 1 in.