The invention discloses a reduction and compression bone screw which includes a shaft, a sleeve, and a head. At two opposite ends of the shaft are a first male thread and a second male thread, respectively, and the first male thread is provided for being affixed to a distal broken bone. The sleeve is provided for being inserted into a proximal broken bone, and has a hole. On an inner surface of a portion of the hole is a female thread which is engaged with the second thread of the shaft, so that the sleeve encircles the end of the shaft having the second male thread for coupling the two broken bones with each other. The head is securely positioned on an outer surface near another portion of the hole and provided for abutting against a surface of the proximal broken bone. In such a way, when the head is rotated, a relative movement between the shaft and the sleeve is generated so that the two broken bones relatively move.本發明提供之具復位及加壓功能的骨釘,含有下列元件:一桿體、一套筒及一頭部。桿體分別形成有一第一公螺紋及一第二公螺紋於桿體的二相對端部,其中第一公螺紋係用來固定於一遠側斷骨。套筒係用來插入至一近側斷骨,且套筒具有一通孔,通孔一側內壁設有一咬合桿體之第二公螺紋的母螺紋,使得套筒環接桿體設有第二公螺紋的端部,用以使近側斷骨及遠側斷骨連接。頭部係一體成形地設置於鄰近套筒之通孔另側的外壁,用來抵靠於近側斷骨的一表面。如此一來,當頭部轉動時,桿體和套筒間會形成一相對位移,使得二斷骨相對地移動。(3)‧‧‧桿體(31)‧‧‧第一公螺紋(32)‧‧‧第二公螺紋(33)‧‧‧尖端(34)‧‧‧卡制槽(41)‧‧‧通孔(42)‧‧‧母螺紋(43)‧‧‧第三公螺紋(5)‧‧‧頭部(51)‧‧‧卡制孔(52)‧‧‧第四公螺紋
