A prosthetic humeral head component (60) comprising: a convex external head surface (62) an internal cavity (64) formed opposite to the head surface (62) and a plurality of fixation elements (70) protruding from said cavity (64) oppositely to said head surface (62) for location into a peripheral portion (17b) of an epiphyseal plate (17) of the humerus (14) to secure the component (60) to the humerus (14), wherein the component is formed as a single, unitary piece. The fixation elements may comprise pegs (70), fins (1080), or keels (2090), or combinations thereof.
