Patent ID: 7255716

Claim:
A multi-component modular joint prosthesis system comprising: a body segment provided with a bore extending completely therethrough; a neck segment comprising a projection that is slidably received in the body segment bore and is provided with a counterbore extending completely therethrough; a stem segment constructed so that when in a first, extended position within the neck segment counterbore, said body segment and said neck segment are locked against rotation relative to one another, and when said stem segment is in a second, retracted position within the neck segment counterbore, said body segment and said neck segment are not locked against rotation relative to one another; and an insertion tool for selective attachment to said stem segment, such that when said insertion tool is attached to said stem segment, said stem segment is free to assume a first, extended position or a second, retracted position, and when said insertion tool is attached to said stem segment and said stem segment is in the first, extended position within the body segment bore, such that said body segment and said neck segment are locked against rotation relative to one another, said insertion tool is movable to drive said stem segment from the first, extended position to the second, retracted position, whereby to permit said body segment and said neck segment to rotate relative to one another.