Abstract: The present invention provides orthopedic devices useful in applying tension or compression to biological tissues, and facilitating surgical procedures. Various aspects of the invention include a split-nut fastener, a tension bolt, a suture nut, a pivot wing bolt and a transverse impaction screw. Each of these devices reduces surgery time, improves the reliability of the tissue position and simplifies surgical procedures as compared to known devices. The split-nut is used in combination with many implantable fasteners used in orthopedic devices. The split-nut, which has two halves, slides down a threaded rod until a ring surrounding the two halves forces them together. The split-nut is then readily threaded tightly onto the threaded rod. The pivot wing bolt assembly is used to secure one end of a threaded rod into the hollow or marrow of a fractured bone. Together with the split-nut or any other nut, the pivot wing bolt is used to fixate the fractured bone.