Patent ID: 8142512

Claim:
An instrument for use in a joint replacement procedure, comprising: a head part which corresponds to the head of an orthopaedic joint component, wherein the head part has a bearing surface defined by a part of a sphere and a head axis defined by the bearing surface, and wherein the head part has a bore formed therein having a bore surface and a bore axis, the bore axis being located eccentrically relative to the head axis; a connector having an external surface, a connector axis defined by the external surface, and a connector feature having a connector feature axis, the connector feature adapted for connecting the head part to a corresponding connection feature on a stem part of the orthopaedic joint component which is intended for location in the intramedullary cavity of a bone, wherein the connector is at least partially disposable within the bore of the head part in one of a plurality of angular orientations, and wherein the connector comprises a body part and a trigger that is attached to the body part, the trigger being moveable relative to the body part between an unlocked position, where the connector can be moved relative to the head part between different ones of the plurality of angular orientations, and a locked position, where the trigger contacts the inner bore surface to restrain the connector from moving relative to the head part, the axis of the connection feature on the connector is located eccentrically relative to the connector axis, the connector axis being defined by the external surface that engages the bore in the head part when the connector and the head part are assembled.