Patent ID: 7179297

Claim:
A set of trial prosthesis instrumentation for use in trial fitting of a medical implant consisting essentially of a single outer component and a single inner component, wherein the outer component comprises an exterior surface characterized by a substantially hemispherical shape to correspondingly mate with a joint socket and an interior surface characterized by a substantially hemispherical shape, said interior surface of said outer component having a size and shape to directly mate with said inner component when used for unipolar trials and to directly mate with a provisional head component when used for bipolar trials, wherein said inner component comprises an exterior surface that is shaped to correspondingly mate with the interior surface of the outer component and an interior surface characterized by a substantially columnar shape that correspondingly mates with a prosthetic stem for unipolar trials, wherein said single inner component comprises a peripheral rim to permit no more than restricted articulation between said single inner component and said single outer component.