Shoulder prosthesis

1. An apparatus for repairing a fractured humeral bone, comprising:

a shoulder prosthesis having a shaft positionable within the medullary canal of a humeral bone, the shaft defining one or more holes; and

a positioning jig for positioning the shoulder prosthesis at a desired height in the medullary canal, the positioning jig including

a humeral engagement portion configured to engage the humeral bone,

a prosthesis holder portion coupled to the humeral engagement portion such that the prosthesis holder portion engages and holds the shoulder prosthesis in the medullary canal at an adjustable height relative to the humeral bone while the humeral engagement portion is engaged with the humeral bone, and

a targeting portion coupled to the prosthesis holder portion and configured to target one or more locations on the humeral bone corresponding to the one or more holes defined by the shaft of the shoulder prosthesis.

2. The apparatus of claim 1 , wherein the humeral engagement portion is configured to engage an exposed portion of the humeral bone.

3. The apparatus of claim 1 , wherein the targeting portion includes a drill guide configured to direct a drill toward the one or more locations corresponding to the one or more holes, so that a fastener may be inserted through the bone and at least one of the one or more holes.

4. The apparatus of claim 1 , further comprising an adjustment portion coupling the humeral engagement portion to the prosthesis holder portion and being operative to drive translational motion of the prosthesis holder portion with respect to the humeral engagement portion such that the height changes.

5. The apparatus of claim 4 , wherein the adjustment portion is configured to convert rotary motion of part of the adjustment portion into translational motion of the prosthesis holder portion.

6. The apparatus of claim 5 , wherein the adjustment portion includes a handle configured to be grasped and turned by hand to drive the translational motion of the prosthesis holder portion.

7. The apparatus of claim 4 , wherein the adjustment portion includes a threaded rod, and wherein the translational motion of the prosthesis holder portion is driven by rotation of the threaded rod.

8. An apparatus for repairing a fractured humeral bone, comprising:

a shoulder prosthesis; and

a positioning jig for positioning the shoulder prosthesis at a desired height in the medullary canal of the humeral bone, the positioning jig including

a humeral engagement portion configured to engage the humeral bone,

a prosthesis holder portion configured to engage and hold the shoulder prosthesis at a height in the medullary canal with the humeral engagement portion engaged with the humeral bone, and

an adjustment portion coupling the humeral engagement portion to the prosthesis holder portion and configured to convert rotary motion of part of the adjustment portion into translational motion of the prosthesis holder portion with respect to the humeral engagement portion such that the height changes.

9. The apparatus of claim 8 , wherein the adjustment portion includes a handle configured to be grasped and turned by hand to drive the translational motion of the prosthesis holder portion.

10. The apparatus of claim 8 , wherein the adjustment portion includes a threaded rod, and wherein the translational motion of the prosthesis holder portion is driven by rotation of the threaded rod.

11. The apparatus of claim 8 , wherein the shoulder prosthesis has a shaft positionable within the medullary canal of a humeral bone, and wherein the shaft defines one or more holes, further comprising a targeting portion coupled to the prosthesis holder portion and configured to target one or more locations on the humeral bone corresponding to the one or more holes defined by the shaft of the shoulder prosthesis.