Abstract: A plug is provided for securing two components of an orthopedic implant where at least one of the components is formed of material softer than the material of the plug. In a preferred embodiment the components comprise concentric cups rotatable with respect to one another about an axis. The components are fixable using a plug to prevent rotation of the components with respect to each other. The invention is preferably used with an acetabular shell and liner of a hip implant wherein the shell is comprised of metal material and the liner is comprised of a polymer or other similar soft material. The plug has a serrated head and a distal lip or anchoring edge to provide securement at more than one location along the length of the plug. The plug is insertable into a common opening defined by aligned recesses or openings of the two components of the implant.

Abstract: An acetabular cup system is provided in which an insert or liner may be selected from a plurality of types of inserts to be used with an acetabular shell. One insert may be oriented after it is removably inserted into the acetabular shell. After an orientation is selected, it may be permanently fixed by pins. The other insert includes a snap-in ring that allows the insert to be snapped into position with the shell after its orientation is selected. The snap-in insert and ring are removable from the shell using a device for removing such snap-in insert and ring.