Offset press-fit tibial stem

A two-piece offset, press-fit implant stem system comprising:

• a baseplate defining a first piece;
• a stem defining a second piece and having a main body portion and a baseplate connection portion, the baseplate connection portion being attached to the baseplate, and being offset from and integrally connected to the main body portion;
• the main body portion having a first centroidal axis passing therethrough;
• the baseplate connection portion having a second centroidal axis passing therethrough;
• and
• the offset being such that the second centroidal axis also passes through the main body portion.

A method of mounting a two-piece offset, press-fit tibial stem system comprising the steps of:

• forming a canal in a tibia by removing cancellous bone;
• orienting a stem for one of a medial and a lateral offset within the canal, the stem defining a first piece and having a baseplate connection portion offset from and integrally connected to a main body portion;
• mounting a baseplate on the baseplate connection portion of the stem, the baseplate defining a second piece and the offset being such that, a first centroidal axis of the baseplate connection portion and a second centroidal axis of the main body portion, each pass through the main body portion;
• and
• press-fitting the main body portion in contact with cortical bone in the canal such that the baseplate is mounted on an end of the tibia free of overhanging the end of the tibia.

A two-piece offset, press-fit implant stem system comprising:

• a baseplate defining a first piece and including a stem receiving recess formed therein, the recess being keyed for receiving a stem in one of a first position and a second position;
• the stem defining a second piece having a main body portion integrally connected to a baseplate connection portion;
• the baseplate connection portion being keyed to engage the recess in one of the first position and the second position;
• means for transitioning the baseplate connection portion to be offset from, and connected to, the main body portion;
• the main body portion having a first centroidal axis passing therethrough;
• the baseplate connection having a second centroidal axis passing therethrough;
• and
• the offset being such that the first centroidal axis and the second centroidal axis each pass through the main body portion, whereby the first position provides a medial offset between the baseplate and the stem and the second position provides a lateral offset between the baseplate and the stem.

An offset, press-fit implant stem comprising;

• a main body portion;
• a baseplate connection portion being offset from and connected to the main body portion and having an end with a key member adapted to engage a tibial baseplate wherein the key member orients the stem with the baseplate in either a first position or a second position that is 180 degrees opposed to the first position;
• the main body portion having a first centroidal axis passing therethrough;
• the baseplate connection portion having a second centroidal axis passing therethrough;
• and
• the offset being such that the first centroidal axis and the second centroidal axis each pass through the main body portion.

An offset, press-fit implant stem system comprising:

• a baseplate having first and second keyed slots, the first keyed slot being 180 degrees opposed to the second keyed slot;
• a stem having a main body portion and a baseplate connection portion, the baseplate connection portion being attached to the baseplate, and being offset from, and connected to, the main body portion by a transition portion;
• the main body portion having a first centroidal axis passing therethrough;
• the baseplate connection portion having a second centroidal axis passing therethrough;
• and
• the offset being such that the second centroidal axis also passes through the main body portion.