Abstract: An intramedullary fixation assembly for bone fusion includes a first member positioned at a proximal end of the intramedullary fixation assembly, and a second member positioned at a distal end of the intramedullary fixation assembly. The first member is slideably coupled to the second member and provides for an interference fit with the second member. The intramedullary fixation assembly includes an optional cannulated threaded screw member having a plurality of threads on an external surface of the threaded screw member.

Abstract: The invention comprises a method for fixating bones in the foot by aligning the bones in their desired position, inserting a screw in the aligned bones, inserting at least one transverse element near the head or tip of the screw, and tightening the screw to compress the bones. The screw comprises a shaft having first and second ends with spirally wound screw threads beginning near the first end and extending along the shaft. Advantageously, the screw is cannulated and screw threads are formed on an interior surface of the cannulation. Illustratively, the transverse elements may be staples, open-ended washers, or open-ended nuts. Reduction instruments and drill guides used in the invention are also disclosed.

Abstract: An intramedullary fixation assembly for bone fusion includes a first member positioned at a proximal end of the intramedullary fixation assembly, where the first member includes a plurality of first and second retaining screws, and a second member positioned at a distal end of the intramedullary fixation assembly, where the second member includes a plurality of third and fourth retaining screws. The first member is slideably coupled to the second member and provides for an interference fit with the second member.

Abstract: A fixation system, including an intramedullary fixation assembly and an instrument for coupling the intramedullary fixation assembly to bones. The intramedullary fixation assembly includes a proximal screw member positioned at a proximal end of the intramedullary fixation assembly, a distal member positioned at a distal end of the intramedullary fixation assembly, where the proximal screw member is slideably coupled to the distal member and makes a fixed angle with the distal member.