Patent ID: 8409294

Claim:
A cup component of an orthopaedic joint prosthesis for fixing to a patient's bone, which comprises: a hollow shell configured to receive a head part of a mating component of the joint prosthesis, the shell having a periphery, an open face and a flange proximate the open face extending around at least part of the periphery, the flange having at least two major threaded bores extending therethrough and at least one minor threaded bore extending therethrough, wherein the diameter of the minor bore is less than the diameter of the at least two major bores and the pitch of the thread in the minor bore is less than that of the thread in the at least two major bores, at least two fixation screws, each of which comprise a shank having an external surface, the shanks having approximately equal diameters, each of which is threaded on the external surface and is configured (i) to engage the thread of a respective one of the bores in the shell flange, and (ii) to threadingly engage the bone, and a temporary screw having a self-drilling tip for forming a bore in the bone, and a diameter and a thread that are configured to threadingly engage the thread in the minor bore.