Shape-fit glenoid reaming systems and methods

1. A system for resecting a preoperatively planned depth into bone comprising:

a guide having a patient specific contact surface that contacts a surface of the bone in a preoperatively planned position, the guide having a cannulated portion including a length; and

a marking pin having first and second ends, the first end adapted to be drilled into the bone, the marking pin having at least one reference feature on an outer surface thereof,

wherein the length of the cannulated portion of the guide is based on a location of the at least one reference feature on the outer surface of the marking pin, and

wherein the preoperatively planned depth is defined by a depth the marking pin is drilled into the bone such that the at least one reference feature of the marking pin lies adjacent to a receiving end of the cannulated portion when the marking pin is received within the cannulated portion of the guide.

2. The system of claim 1 further comprising:

a cannulated reamer having a shaft portion coupled to a reamer portion.

3. The system of claim 2 , wherein the shaft portion has an internal guide portion and the reamer portion includes a central aperture, the marking pin being adapted to be inserted through the central aperture and into the internal guide portion.

4. The system of claim 3 , wherein the internal guide portion includes a stop surface.

5. The system of claim 4 , wherein a linear reamer distance is defined by a distance between an outer surface of the reamer portion adjacent the central aperture thereof and the stop surface of the guide portion of the shaft portion.

6. The system of claim 5 , wherein when the marking pin is drilled into the bone a linear marking distance is defined by the distance between the second end of the marking pin and a location of a desired reaming depth inside the bone.

7. The system of claim 6 , wherein the linear reamer distance is substantially the same as the linear marking distance.

8. The system of claim 6 , wherein a linear resection depth is defined by the distance between the surface of the bone prior to resection and the location of the desired reaming depth inside the bone.

9. The system of claim 1 , wherein the cannulated portion of the guide forms an internal wall having a receiving end and an exiting end, the internal wall adjacent the receiving end of the cannulated portion having a protrusion extending outwardly therefrom.

10. The system of claim 9 , wherein the at least one reference feature on the outer surface of the marking pin is an indentation such that when the marking pin is received in the receiving end of the cannulated portion of the guide and translates with respect to the cannulated portion until the protrusion engages the indentation to inhibit the translation of the marking pin with respect to the cannulated portion.

11. A method of resecting a preoperatively planned depth into bone comprising:

contacting a surface of the bone in a preoperatively planned position with a guide having a patient specific contact surface, the guide having a cannulated portion including a length;

inserting a first end of a marking pin into the cannulated portion of the guide and into contact with the surface of the bone, the marking pin having at least one reference feature on an outer surface thereof, the preoperatively planned resection depth determined by a location of the at least one reference feature and the length of the cannulated portion; and

drilling at least a portion of the marking pin into the bone until the at least one reference feature on the outer surface of the marking pin lies adjacent a receiving end of the cannulated portion of the guide.

12. The method of claim 11 , further comprising:

removing the guide from the marking pin; and

inserting the marking pin into a cannulated reamer.

13. The method of claim 12 , further comprising:

reaming the bone with the cannulated reamer until a second end of the marking pin contacts a stop surface of an internal guide portion of the cannulated reamer.

14. The method of claim 13 , wherein the cannulated reamer has a shaft portion coupled to a reamer portion, the shaft portion including the internal guide portion and the reamer portion including a central aperture, the marking pin inserted through the central aperture and into the internal guide portion.

15. The method of claim 14 , wherein a linear reamer distance is defined by a distance between an outer surface of the reamer portion adjacent the central aperture thereof and the stop surface of the guide portion of the shaft portion.

16. The method of claim 15 , wherein when the marking pin is drilled into the bone a linear marking distance is defined by the distance between the second end of the marking pin and a location of a desired reaming depth inside the bone.

17. The method of claim 16 , wherein the linear reamer distance is substantially the same as the linear marking distance.

18. The method of claim 16 , wherein a linear resection depth is defined by the distance between the surface of the bone prior to resection and the location of the desired reaming depth inside the bone.

19. The method of claim 11 , wherein the length of the cannulated portion of the guide is based on a location of the at least one reference feature on the outer surface of the marking pin.