Stemless shoulder implant

A shoulder prosthesis comprising:

• a glenoid component including a glenoid body having a proximal side and a distal side, the proximal side shaped to engage with a resected portion of a glenoid cavity;
• a humeral component including a humeral body having a proximal side and a distal side, the distal side shaped to engage with a resected portion of a humerus;
• and
• an articulation component against which the glenoid component and the humeral component articulate, the articulation component positionable between the distal side of the glenoid component and the proximal side of the humeral component, the articulation component configured to be maintained between the glenoid and humeral components, after implantation, by at least a deltoid muscle and a rotator cuff muscle,
• wherein a cross section of the articulation component has a continuous perimeter forming glenoid and humeral articulation surfaces, a first portion of the continuous perimeter having a first radius of curvature and a second portion of the continuous perimeter located opposite the first portion and having a second radius of curvature, the first radius of curvature being larger than the second radius of curvature, the first portion of the continuous perimeter located proximate an acromion bone when implanted,
• wherein the articulation component is asymmetrical about a centerline that extends from an apex of the second portion of the continuous perimeter to the first portion, and
• wherein the articulation component is asymmetrical about a second axis of the articulation component that extends perpendicular to the first central axis.