A modular acetabular anti-protrusio cage and acetabular cup combination includes
an acetabular cup having a bone ingrowth-promoting surface and a shaped anti-protrusio
cage having one or more fixation flanges. The acetabular cup is attached to acetabular
bone, and the anti-protrusio cage is thereafter mounted to the inner surface of
the acetabular cup. Alternatively, the anti-protrusio cage can be mounted to the
inner surface of the acetabular cup before the acetabular cup is attached to acetabular
bone. The flanges of the anti-protrusio cage are joined to the ilium, ischium and/or
pubis to secure the acetabular cup and the anti-protrusio cage to the hip bone
and to distribute forces away from the medial wall of the acetabulum. After the
cup and the cage are mounted in the patient, a bearing insert is secured within
the interior of the anti-protrusio cage, and a prosthetic femoral head is positioned
in the bearing insert.
