Abstract: A kit and a method for implanting a prosthetic acetabular cup in an acetabular has a prosthetic acetabular cup having an open end for receiving a head of a prosthetic femoral component. The cup has a flange extending outwardly from a surface thereof adjacent the open end. The flange is angled toward the acetabulum. The acetabulum is prepared to receive the prosthetic acetabular cup, the preparation includes forming a circumferential rim shaped seat in the bone around the acetabulum. The cup flange has a maximum diameter less than the outer diameter of the circumferential rim.

Abstract: An acetabular rim cutter has an annular cutting face provided on a rotatable carrier. A coupler is provided for attaching the carrier to a rotational power source. A guide element is axially aligned with the cutting face to locate and align the cutting face on the acetabulum with which it is to be used. Preferably, the guide element is axially movable in relation to the cutting face and a resilient element is provided for biasing it axially away therefrom.