Acetabular prosthesis with anchoring pegs

Claim 1

An acetabular cup prosthesis, comprising: a) an acetabular cup body having an inner concave surface and an outer convex surface; b) a plurality of openings that extend between the inner and outer surfaces, the openings forming bores surrounded by a bore wall portion of the acetabular cup body at least two of the bores have axes that are not parallel to each other; c) the openings being positioned to define drill guides so that the surgeon can drill into the underlying tissue and form surgical openings therein via the openings; d) at least one peg closure member, each being insertable into and registering respectively with one of the openings, each peg member having a first proximal end portion having means thereon for forming a substantially rigid connection with the acetabular cup body at one of the openings and with the bore wall; and e) wherein the closure members are disposed between the concave and convex surfaces of the cup body during use, and wherein each peg closure member has a length substantially greater than the diameter of the peg closure member for extending into and engaging the underlying bone tissue.