Containment system for constraining a prosthetic component

Implant, comprising: (a) a first element (14) implant structural adapted to accommodate the head (12) of rod (13) of an implant, comprising: an outer surface and a flange (36); and an inner surface (18) forming a cavity (16) having a generally spherical shape, further including the inner surface a band (22), extending the band (22) around only part of the rim (36) of the element (14) implant structural, including an inner surface that is a continuation of the inner surface (18) of generally spherical shape of the cavity (16) of the implant structural member and shaped to correspond generally to an outer surface of the head implant stem, the band (22) adapted to allow the head (12) implant stem is inserted into the cavity (16) of the structural element when the head (12) implant stem is oriented in a first orientation and restrict the head (12) implant stem within the cavity (16) when the head (12) implant stem is oriented in a second orientation and is attached to stem (13); (B) a head (12) implant stem, comprising: a generally spherical body having a surface (24) configured to correspond to the web (22) that allows the head (12) implant stem is inserted in the structural element (14) when the implant head (12) implant stem is in the first orientation; And a cavity (26) for receiving a rod (13) implant; and (c) a rod (13) implant adapted to engage the head (12) implant stem, wherein the head (12) implant stem can be articulated inside the first element (14) implant structural but can not withdraw from the first element (14) implant structural once it is attached to the stem (13).