Patent ID: 8574304
Filing Date: 2013-11-05
Classification: A61F

Abstract:
1. A method of performing a tibial arthroplasty, the method comprising: resecting a proximal end of a tibia to create a resected tibial surface, the tibia having an anteriorly disposed tibial tubercle and a connection point to a posterior cruciate ligament; identifying an anatomic anteroposterior axis which intersects: providing a tibial prosthesis having alignment indicia indicating a component anteroposterior axis designed to be aligned with the anatomic anteroposterior axis, the tibial prosthesis including a tibial baseplate having a lateral compartment and a medial compartment which cooperate to define a peripheral wall, the peripheral wall including: positioning and orienting the tibial prosthesis with respect to the tibia by aligning the alignment indicia with the anatomic anteroposterior axis, wherein said step of positioning comprising matching the component asymmetry to a corresponding asymmetry of the resected tibial surface, whereby the tibial prosthesis covers a large proportion of the resected tibial surface, and wherein the component asymmetry comprises an anteroposterior extent asymmetry, in which: the lateral compartment defines a lateral anteroposterior extent extending from the anterior edge of the peripheral wall to the lateral posterior edge thereof; and the medial compartment defines a medial anteroposterior extent extending from the anterior edge of the peripheral wall to the medial posterior edge thereof, the medial anteroposterior extent larger than the lateral anteroposterior extent, and said step of positioning comprising: wherein the component asymmetry comprises an anteroposterior corner asymmetry, in which: an anterior-medial corner of the medial periphery defines an anterior-medial corner radius, and an anterior-lateral corner of the lateral periphery defines an anterior-lateral corner radius that is substantially smaller than the anterior-medial corner radius, said step of positioning comprising: providing a tibial bearing component comprising: