Patient specific humeral cutting guides

1. A method of resecting a humerus, comprising:

positioning a multi-part guide on the humerus, the multi-part guide comprising a support portion and a positioning jig;

advancing at least two mounting pins through the support portion along diverging paths;

inserting a guide pin through an aperture defined by a boss of the positioning jig to form a pin channel in a head of the humerus;

removing the positioning jig from its connection with the support portion of the multi-part guide; and

resecting the humerus with reference to a cutting surface of the support portion to form a resected humeral surface.

2. The method of claim 1 , further comprising assembling the multi-part guide prior to positioning the multi-part guide on the humerus.

3. The method of claim 1 , further comprising advancing a reamer through the resected surface with reference to a guide structure to form a recess in the humerus.

4. The method of claim 3 , further comprising placing a stem location guide within the recess and orienting the stem location guide according to the support portion.

5. The method of claim 4 , further comprising advancing a stem tamp into the humerus with reference to the stem location guide.

6. The method of claim 1 , further comprising advancing a stemless anchor into the exposed cancellous surface.

7. The method of claim 6 , further comprising advancing a locking device into the stemless anchor.

8. The method of claim 6 , further comprising mounting an articular body to the stemless anchor.

9. The method of claim 1 , further comprising:

planning, in a virtual model, a resection of the bone; and

designing a cut guide according to the planned resection.

10. A method of resecting a humerus, comprising:

positioning a multi-part guide on the humerus, the multi-art guide comprising:

a support portion comprising at least one area configured for contact with a humeral bone surface and defining a resection surface and a plurality of mounting pin holes; and

a releasable positioning jig configured to be mounted to the support portion, the releasable positioning jig having at least one area configured to contact the humeral head and defining an aperture;

advancing at least two mounting pins through the support portion and into the humerus;

inserting a guide pin through the aperture defined by the releasable positioning jig and into the humeral head to form a pin channel while the releasable positioning jig is mounted to the support portion;

removing the positioning jig from its mounting to the support portion; and

resecting the humerus with reference to the cutting surface defined by the support portion to form a resected humeral surface,

wherein the resected humeral surface defines at least a portion of the pin channel.

11. The method of claim 10 , further comprising assembling the multi-part guide prior to positioning the multi-part guide on the humerus.

12. The method of claim 10 , further comprising advancing a reamer through the resected humeral surface with reference to a guide structure to form a recess in the humerus.

13. The method of claim 12 , further comprising placing a stem location guide within the recess and orienting the stem location guide according to the support portion.

14. The method of claim 13 , further comprising advancing a stem tamp into the humerus with reference to the stem location guide.

15. The method of claim 10 , further comprising advancing a stemless anchor into the exposed cancellous surface.

16. The method of claim 15 , further comprising advancing a locking device into the stemless anchor.

17. The method of claim 15 , further comprising mounting an articular body to the stemless anchor.

18. The method of claim 10 , further comprising:

planning, in a virtual model, a resection of the bone; and

designing a cut guide according to the planned resection.

19. The method of claim 1 , wherein the pin channel is formed in the head of the humerus to have a depth such that a portion of the pin channel is present in the resected humeral surface after the humerus is resected with reference to the cutting surface.

20. The method of claim 10 , wherein the releasable positioning jig includes a boss having a patient-specific surface configured to engage the humeral head, the boss defining the aperture.