A) vertical axis (3), the front end (4), the rear end (5) and it possesses the perforation hole (6) the vertical shaft which to include (2), the aforementioned perforation hole as for (6), the aforementioned shaft (2) the aforementioned front end from (4) the aforementioned rear end to (5) the batten, B) the aforementioned shaft (2), it adjoins in the aforementioned rear end (5) the rear section where (8) with, it adjoins in the aforementioned front end (4) the open-ended front part which (7) with to consist of, the aforementioned open-ended front part (7) the nail inside the marrow (30) the distal (2036) fixed hole (31) being insertion possible, can expand the aforementioned vertical axis (3) reversibly in horizontal shaft direction the reference pin which (1) be, the aforementioned reference pin (1) furthermore, C) the aforementioned perforation hole (6) movement it is installed possibly inside, the aforementioned open-ended front end (7) the extension part which is suited for reversible expansion (9) it includesThe reference pin which is used during fracture remedying which features thing (1).A)縦軸(3)、前端(4)、後端(5)および貫通孔(6)を有する縦シャフト(2)を含み、前記貫通孔(6)は、前記シャフト(2)を前記前端(4)から前記後端(5)へと貫き、B)前記シャフト(2)は、前記後端(5)に隣接する後部(8)と、前記前端(4)に隣接する拡張可能な前部(7)とからなり、前記拡張可能な前部(7)は骨髄内釘(30)の遠位の固定孔(31)に挿入可能で前記縦軸(3)の横軸方向に可逆的に拡張できるリファレンスピン(1)であり、前記リファレンスピン(1)がさらに、C)前記貫通孔(6)内に移動可能に設置され、前記の拡張可能な前端部(7)の可逆的な拡張に適した伸張部品(9)を含むことを特徴とする骨折治療中に使用されるリファレンスピン(1)。