Patent ID: 7572297

Claim:
A joint prosthesis comprising: a head member so sized and shaped as to be articulatable with a joint socket, the head member defining a head bore; a proximal body member that includes: a base; a plug protruding from the base and so sized and shaped as to be receivable in the head bore; and a spigot protruding from the base, the spigot including a locking band with a constant cross-sectional geometry along its length; and a stem member that includes: a proximal portion defining a stem bore that: is sized and shaped for receiving the spigot; and includes a receiving portion with a constant cross-sectional geometry along its length that is sized smaller than that of the locking band so that the locking band of the spigot engages the receiving portion by friction-tight press-fit as the proximal body member becomes fully seated on the stem member; and a shaft extending from the proximal portion, being sized and shaped for seating in a cavity of a long bone, and including: a midshaft portion of the stem member, at least a portion of which is so tapered that the cross-sectional area of the shaft in that portion continuously decreases distally; and a distal portion of the stem member, the distal portion terminating with a rounded distal tip.