Patent ID: 8114091

Claim:
A surgical instrument for implanting at least a tibial prosthesis on a prepared bottom end of a tibia and a talus prosthesis on a prepared top surface of a talus of an ankle joint, the surgical instrument comprising: at least one tibial phantom generally corresponding to at least some geometric features of the tibial prosthesis, the tibial phantom comprising a top surface adapted to move freely against the prepared bottom end of the tibia; at least one talus phantom generally corresponding to at least some geometric features of the talus prosthesis, the talus phantom adapted to engage with the prepared top surface of the talus; and at least one phantom skid located between the tibial phantom and the talus phantom, the phantom skid engaged with the tibial phantom with no freedom of movement between the tibial phantom and the phantom skid, such that dynamic engagement between the phantom skid and the talus phantom through extension and flexion of the ankle joint positions the tibial phantom relative to the prepared bottom end of the tibia.