US Patent 7485148 Prosthesis

An acetabular component prosthesis adapted for affixation in a recess in a pelvis, comprising:a cup shell having a generally convex outer surface adapted to be in contact with the bone in use, a generally concave inner surface and a rim;at least one pair of substantially adjacent flanges extending from the outer surface of the cup at a point proximal to the rim of the cup and angled at angle θ downwardly thereto;one flange of the pair being at an equal but opposite angle α to a plane extending across the apex of each of the flanges to the other of the pair; andat least one aperture in each of the pair of flanges through which in use fixation means may be passed to fix the cup into the recess in the pelvis.