Modular acetabular anti-protrusio cage and porous ingrowth cup combination

A modular acetabular support structure for receiving a socket of a hip joint prosthesis, the structure comprising:

• an anti-protrusio cage having a body and at least one fixation flange attached to the body, the body of the anti-protrusio cage having an inner surface suitable for engaging an outer surface of the socket;
• and
• an acetabular cup including a wall terminating in a rim defining a cavity of the acetabular cup, the wall having an outer surface and having an inner surface within the cavity of the acetabular cup, at least a portion of the inner surface of the acetabular cup being dimensioned to essentially conform to at least a section of an outer surface of the body of the anti-protrusio cage,
• wherein at least a part of the anti-protrusio cage is installed in the cavity of the acetabular cup such that the section of the outer surface of the body of the anti-protrusio cage is positioned in abutting relationship with the portion of the inner surface of the acetabular cup and such that each fixation flange extends outwardly from the rim of the wall of the acetabular cup.