Patent ID: 8764845

Claim:
A kit for use in a procedure for implantation of an orthopaedic joint prosthesis, comprising: a head component having a periphery and an axis, the head component comprising a convex bearing surface, a reverse face, and a chamfer surface extending around at least part of the periphery, and wherein the head component has a maximum width, the reverse face has a width that is less than the maximum width of the head component, the chamfer surface extends inwardly from the bearing surface toward the axis and connects the bearing surface and the reverse face, and the chamfer surface has a plurality of markings; and a trial head component comprising a body part having a convex trial bearing surface and a reverse face, wherein the trial head component has a plurality of markings on the trial bearing surface at or towards the interface between the bearing surface and the reverse face, wherein the transverse dimensions of the head component are approximately the same as the transverse dimensions of the trial head component, and wherein the location of the plurality of markings on the chamfer surface of the head component corresponds to the location of the plurality of markings on the trial bearing surface of the trial head component.