Patent ID: 7135044

Claim:
A modular prosthesis kit comprising: at least two differently sized stems, each stem including a tapered bore having a distal portion and a proximal portion and a neck registration element located in the distal portion of the bore; and a plurality of necks, each of the necks having a proximal end and a distal end, the distal end including a tapered portion configured to taper lock in the tapered bore and a stem registration element, the plurality of necks including a first neck having a stem registration element that cooperates with the neck registration element of first stem to permit the first neck to taper lock in the bore of said stem in one position and to prevent the first neck from taper locking in the bore of second stem in at least one position, the first stem in which the first neck taper locks being different from the second stem in which the first neck is prevented from taper locking, said first stem being a different size then said second stem.