Shoulder prosthesis

1. A prosthesis comprising:

a central body having a longitudinal axis and an opening operable to receive an installation tool; and

a plurality of arms each including a solid body attached to said central body and a porous coating covering said solid body, said porous coating providing each of said plurality of arms with an outer shape having a different shape than said solid body and including a first surface, a second surface, and a third surface that are each formed at an obtuse angle relative to one another to define said outer shape.

2. The prosthesis of claim 1 , wherein said solid body includes a first surface and a second surface formed substantially perpendicular to said longitudinal axis.

3. The prosthesis of claim 2 , wherein said solid body includes at least one third surface extending between said first surface and said second surface, said third surface being substantially planar.

4. The prosthesis of claim 2 , wherein said solid body includes at least one third surface extending between and connecting said first surface and said second surface, said third surface extending substantially parallel to said longitudinal axis.

5. The prosthesis of claim 2 , wherein said first surface and said second surface are attached to and extend from said central body.

6. The prosthesis of claim 1 , wherein said central body includes a bore in communication with said opening.

7. The prosthesis of claim 6 , wherein said bore is one of a blind bore or a through bore.

8. The prosthesis of claim 6 , wherein said bore includes a series of stepped portions.

9. The prosthesis of claim 6 , wherein said bore has at least one of a threaded portion and a Morse taper.

10. The prosthesis of claim 1 , wherein said first surface, said second surface, and said third surface are each formed at an acute angle relative to said longitudinal axis.

11. A prosthesis comprising:

a central body having a longitudinal axis; and

a plurality of arms each including a solid body attached to said central body and a porous coating surrounding said solid body, said porous coating providing each of said plurality of arms with an outer shape independent of a shape of said solid body and including a first surface, a second surface, and a third surface that are each formed at an obtuse angle relative to one another to define said outer shape.

12. The prosthesis of claim 11 , wherein said solid body includes a first surface and a second surface formed substantially perpendicular to said longitudinal axis.

13. The prosthesis of claim 12 , wherein said solid body includes at least one third surface extending between said first surface and said second surface, said third surface being substantially planar.

14. The prosthesis of claim 12 , wherein said solid body includes at least one third surface extending between and connecting said first surface and said second surface, said third surface extending substantially parallel to said longitudinal axis.

15. The prosthesis of claim 14 , wherein said first surface and said second surface are attached to and extend from said central body.

16. The prosthesis of claim 12 , wherein said central body includes an opening operable to receive an installation tool and a bore in communication with said opening.

17. The prosthesis of claim 16 , wherein said bore is one of a blind bore or a through bore.

18. The prosthesis of claim 17 , wherein said bore includes a series of stepped portions.

19. The prosthesis of claim 16 , wherein said bore has at least one of a threaded portion and a Morse taper.

20. The prosthesis of claim 11 , wherein said first surface, said second surface, and said third surface are each formed at an acute angle relative to said longitudinal axis.