System for identifying positions of an artificial tibial component during total knee arthroplasty

A system comprising:

• a knee ranging tool:
• comprising a base configured to transiently locate on a resected proximal face of a tibia in a knee of a patient;
• defining a tibial reference surface configured to run against a femoral surface of an artificial femoral component, installed on a distal face of a femur of the patient, during articulation of the knee of patient;
• comprising a set of stages:
• interposed between the base and the tibial reference surface;
• configured to locate the tibial reference surface relative to the base;
• and
• compliant to medial-lateral translation, anteroposterior translation, and transverse rotation;
• and
• configured to indicate a medial-lateral translation offset and an anteroposterior translation offset corresponding to a position of the tibial reference surface, relative to the base, that yields elastic deformation of ligaments in the knee over a range of motion of the knee;
• and
• a reaming guide:
• configured to transiently install on the tibia;
• adjustable over a range of medial-lateral translation, and anteroposterior positions;
• and
• configured to locate a tibial reamer, during drilling of the tibia to receive a keel of an artificial tibial component, according to the medial-lateral translation offset and the anteroposterior translation offset.