Fixation system, an intramedullary fixation assembly and method of use

1. An intramedullary fixation assembly for bone fusion, comprising:

a first member comprising a first shaft extending along a first longitudinal axis, said first shaft having first and second ends, a retaining end near the first end, and a first aperture near the second end for receiving a first screw; and

a second member comprising a second shaft terminating at a first terminal end and a second terminal end, and a first aperture at the first terminal end, a second longitudinal axis extending through the first aperture, the second shaft and the second terminal end, a bore extending through the first aperture and the second shaft on a third axis that extends between said first aperture and an exterior surface of said second shaft, and a second aperture near said second terminal end for receiving a second screw;

wherein said first member is configured for coupling to said second member and provides for an interference fit with said second member.

2. The intramedullary fixation assembly of claim 1 , wherein said retaining end comprises a circular end and wherein said first shaft includes a tapered end at said second end.

3. The intramedullary fixation assembly of claim 2 , wherein said first member comprises a hexagonally-shaped aperture, a star-shaped aperture, or a square-shaped aperture disposed at said circular end.

4. The intramedullary fixation assembly of claim 3 , wherein said hexagonally-shaped aperture, said star-shaped aperture, or said square-shaped aperture is provided to receive a complementary shaped end of an instrument.

5. The intramedullary fixation assembly of claim 1 , wherein said second member includes an opening in said second shaft connecting to said bore, said opening being co-axially aligned with said second longitudinal axis.

6. The intramedullary fixation assembly of claim 5 , wherein said opening includes a hexagonally shaped opening, a star-shaped opening, or a square-shaped opening partially disposed in said second shaft.

7. The intramedullary fixation assembly of claim 6 , wherein each said hexagonally shaped opening, said star-shaped opening or said square-shaped opening is provided to receive a complementary shaped member.

8. The intramedullary fixation assembly of claim 5 , wherein said opening has a hexagonal shape, a star shape, or a square shape.

9. The intramedullary fixation assembly of claim 5 , wherein said opening is provided to receive a complementary shaped end of an instrument.

10. The intramedullary fixation assembly of claim 1 , wherein said third axis forms an angle with said second longitudinal axis.

11. The intramedullary fixation assembly of claim 10 , wherein said first member couples to said second member at said angle.

12. The intramedullary fixation assembly of claim 10 , wherein said angle is in the range of about 90 degrees to about 180 degrees.

13. The intramedullary fixation assembly of claim 10 , wherein said angle determines an angle for arch restoration.

14. The intramedullary fixation assembly of claim 10 , wherein said angle determines an angle for restoration.

15. The intramedullary fixation assembly of claim 1 , wherein said first shaft comprises a second aperture near the second end for receiving a third screw, and wherein said first and third screws are configured for insertion into a first bone to couple said first member to said first bone.

16. The intramedullary fixation assembly of claim 15 , wherein said first and second apertures of said first member comprise apertures transverse to said first longitudinal axis for receiving said first and third screws.

17. The intramedullary fixation assembly of claim 1 , wherein said second shaft comprises a third aperture near the second terminal end for receiving a third screw, wherein said second and third screws are configured for insertion into a second bone to couple said second member to said second bone.

18. The intramedullary fixation assembly of claim 17 , wherein said second and third apertures of said second member comprise apertures transverse to said second longitudinal axis for receiving said second and third screws.

19. The intramedullary fixation assembly of claim 1 , wherein said second shaft is tapered from said first end to said second end.

20. The intramedullary fixation assembly of claim 5 , wherein said opening extends from said bore along said second longitudinal axis.

21. The intramedullary fixation assembly of claim 1 , wherein said bore is tapered.

22. The intramedullary fixation assembly of claim 1 , wherein said bore receives said first shaft of said first member, wherein said retaining end resides within said bore, and further wherein said retaining end abuts said first aperture of said second member at said terminal end.

23. The intramedullary fixation assembly of claim 1 , wherein said first member couples to said second member by sliding into said bore until said retaining end of said first member abuts said first aperture of said second member.

24. An assembly for bone fusion, comprising:

a first member comprising a first shaft extending along a first longitudinal axis, the first shaft having first and second ends, a retaining end near the first end, and at least one aperture near the second end for receiving a first screw; and

a second member comprising a second shaft terminating at a first terminal end and a second terminal end, a first aperture at the first terminal end, a second longitudinal axis extending through the first aperture, the second shaft and the second terminal end, a bore extending through the first aperture and the second shaft on a third axis that extends between the first aperture and an exterior surface of the second shaft, and at least one aperture near said second terminal end for receiving a second screw;

wherein the first member is configured for coupling to the second member through the first aperture.