System and method for retrograde procedure
A system and method may be used for accessing an articular surface and for preparing an implant site on the articular surface. The method may include locating a portion of the articular. An access passage may be drilled towards the articular surface though bone behind the articular surface. An implant site may be excised in the articular surface relative to an axis defined by the access passage.
1. A method for replacing a portion of an articular surface comprising:
forming a passage through a first bone behind a first articular surface, said passage extending toward said first articular surface;
advancing a cannulated lumen within said passage until a portion of said cannulated lumen is disposed a predetermined depth beneath said first articular surface; and
advancing a rotary cutter to excise an implant site on said first articular surface relative to said passage until a portion of said rotary cutter contacts said portion of said cannulated lumen.
2. A method according to claim 1 , wherein forming said passage through bone behind said first articular surface comprises establishing a reference axis extending through said first articular surface.
3. A method according to claim 2 , wherein said reference axis intersects said portion of said first articular surface.
4. A method according to claim 2 , wherein establishing said reference axis comprises inserting a guide pin extending at least partially into said first bone.
5. A method according to claim 4 , wherein forming said passage comprises drilling over said guide pin with a cored drill.
6. A method according to claim 2 , wherein said implant site extends radially around said reference axis.
7. A method according to claim 6 , wherein excising said implant site comprises rotating a cutter about said reference axis.
8. A method according to claim 1 , wherein advancing said cannulated lumen includes installing a threaded element at least partially into said passage, said threaded element having an opening extending therethrough defining said lumen.
9. A method according to claim 8 , wherein a depth of said implant site is controlled relative to an upper bearing surface of said threaded element.
10. A method according to claim 1 , further comprising installing an implant into said implant site.
11. A method of claim 1 , wherein advancing said rotary cutter to excise said implant site further comprises advancing said rotary cutter in a retrograde manner.
12. A method of claim 11 , wherein said rotary cutter is coupled to a drive shaft configured to be received within said cannulated lumen.
13. A method of claim 12 , wherein said drive shaft and said cannulated lumen are configured to maintain said drive shaft in a desired alignment during excision of said implant site.
14. A method of claim 1 , wherein said cannulated lumen includes a screw.
15. A method of claim 1 , further comprising securing an implant to said cannulated lumen.
16. A method of claim 15 , wherein securing said implant to said cannulated lumen includes advancing a tapered post of said implant into a corresponding tapered portion of said cannulated lumen.
17. A method of claim 16 , wherein advancing said tapered post of said implant into said corresponding tapered portion of said cannulated lumen further includes applying an axial pressure to said implant.
18. A method of claim 1 , wherein said cannulated lumen includes a fixation element.
19. A method of claim 1 , further comprising accessing a second articular surface of a second bone through said passage, said second articular surface facing said first articular surface.