Shoulder arthroplasty systems and configurations for components thereof

1. A convertible shoulder arthroplasty system comprising:

a baseplate comprising a baseplate body, the baseplate body comprising a lateral side and a medial side, wherein the medial side extends outward in the medial direction to form a substantially convex medial side surface of the baseplate body;

a tapered recess positioned in a central region of the baseplate body, wherein the tapered recess opens to the lateral side of the baseplate body and extends in the medial direction from the lateral side of the baseplate body toward the medial side of the baseplate body;

a fixation component that is fixedly attached, removably attached, integral with, or separate from the baseplate body, wherein the fixation component is attached or is configured to be attached to the central region of the baseplate body and to extend in the medial direction when attached to the baseplate body for securing the baseplate body to a patient's scapula;

a glenoid component for use in an anatomical shoulder arthroplasty, the glenoid component comprising a concave articulating surface and a tapered extension extending from a medial side thereof, wherein the tapered extension is configured to mate with the tapered recess positioned in the central region of the baseplate body for securing the glenoid component to the baseplate body;

a humeral head for use in the anatomical shoulder arthroplasty, the humeral head comprising a convex articulating surface that is configured to mate with the concave articulating surface of the glenoid component;

a glenosphere for use in a reverse shoulder arthroplasty, the glenosphere comprising a convex articulating surface and a tapered recess in a bottom portion thereof;

a double trunnion connector for use in the reverse shoulder arthroplasty that is separate from the baseplate body and the fixation component, wherein the double trunnion connector is configured to attach to both the tapered recess in the baseplate body and to the tapered recess in the bottom portion of the glenosphere for securing the glenosphere to the baseplate body;

a humeral socket for use in the reverse shoulder arthroplasty, the humeral socket comprising a concave articulating surface; and

a humeral component comprising a distal stem and a proximal portion defining a cavity comprising:

a first annular portion extending from a proximal end of the cavity to a lip, and

a second annular portion tapering at a first angle from the lip to a distal tapered portion that tapers at a second angle different from the first angle;

wherein a lateral side of the humeral head and a lateral side of the humeral socket both have a shape that is complementary to, and configured to mate with, the cavity of the humeral component;

wherein the glenosphere and the glenoid component both comprise a metal or ceramic articulating surface; and

wherein the humeral head and the humeral socket both comprise a polymer articulating surface.

2. The system of claim 1 , wherein the fixation component comprises screw threads.

3. The system of claim 1 , wherein the fixation component comprises an osteoinductive material.

4. The system of claim 1 , wherein the fixation component is separate from the baseplate body.

5. The system of claim 1 , wherein the fixation component is integral with the baseplate body.

6. The system of claim 1 , wherein the double trunnion connector comprises a non-threaded proximal end, a non-threaded distal end, a central region, a first tapered portion extending from the non-threaded proximal end to the central region, a second tapered portion extending from the non-threaded distal end to the central region.

7. The system of claim 1 , wherein the baseplate body comprises one or more bores extending through the baseplate body positioned between the tapered recess in the central region of the baseplate body and an outer circumference of the baseplate body.

8. The system of claim 1 , wherein the tapered recess in the baseplate body extends into a portion of the baseplate that extends from the medial side of the baseplate body and that has a first subportion having a first maximum outer diameter and a second subportion that extends from the first subportion and has a second maximum outer diameter that is less than the first maximum outer diameter.