Registration of intramedullary canal during revision total knee arthroplasty

A system for aligning a femoral implant device within a reamed portion of an intramedullary canal of a femur, the system comprising:

• the femoral implant device comprising a femoral load bearing component, an intramedullary stem, and an offset component, wherein the offset component comprises an elongated first end portion and an elongated second end portion opposite the first end portion, wherein an axis of the first end portion is offset from an axis of elongation of the second end portion in order to adjust an alignment of the femoral implant by the offset factor;
• one or more processing units;
• one or more memories in communication with the processing units and storing computer executable instructions which, when executed, cause the one or more processing units to:
• determine an offset factor based on an axis of the reamed portion of the intramedullary canal of the femur;
• and
• optimize an alignment of the femoral load bearing component relative to the intramedullary stem with an offset component.

A computer assisted surgical system, comprising

• a femoral implant device comprising a femoral load bearing component, an intramedullary stem, and an offset component, wherein the offset component comprises an elongated first end portion and an elongated second end portion opposite the first end portion, wherein an axis of the first end portion is offset from an axis of elongation of the second end portion in order to adjust an alignment of the femoral implant by the offset factor;
• a tracking system;
• an effector platform;
• and
• a surgical computer in communication with the tracking system and the effector platform, wherein the surgical computer is configured to:
• determine an offset factor based on an axis of the reamed portion of the intramedullary canal of the femur;
• and
• optimize an alignment of the femoral load bearing component relative to the intramedullary stem with an offset component.