A joint prosthesis, as a replacement for a ball and socket type joint, has
a head that allows for infinite dialability and/or angular orientation
with respect to an implanted stem, particularly during a procedure for
implanting the prosthesis. The angular orientation is positionable and
fixed or locked in a set position without utilizing external or separate
fasteners. An expandable conjoining member associated with the prosthesis
stem receives the head and allows for the positioning thereof. The
expandable conjoining member is fixed in position through expansion of
the expandable conjoining member to produce a friction fit (wedging) of
the expandable conjoining member within a receiving socket of the stem.
Expansion of the expandable conjoining member is achieved through
coupling interaction of a stem of the head with the conjoining member.