Patent ID: 7192449

Claim:
A prosthesis comprising: a substantially rigid shell for attachment to skeletal structure, the shell including a shell wall defining a shell receiving area and a terminal shell margin defining a shell opening to the shell receiving area, the shell wall including an inwardly extending recessed region presenting a circumferential catch ledge proximal to said shell margin; a resiliently yieldable liner for insertion in the shell receiving area, the liner including a liner wall having a liner inner surface defining a liner receiving area, the liner wall having a terminal liner margin defining a restricted liner opening to the receiving area; and a substantially rigid retainer ring presenting an axially extending catch leg having a catch lip extending outwardly from the catch leg, upon assembly of the prosthesis, the ring engaging the liner wall to inhibit deformation thereof and the catch lip extending into the confines of said recessed region and engaging the catch ledge to secure the liner in the shell receiving area.