Patent Document ID: 9707087
Application ID: 15165031
Patent Flag: 1

Claim One:
1. A knee prosthesis, comprising: one or more tibial components, comprising: a post with a proximal end, a distal end, an anterior surface, and a posterior surface that is substantially opposite from the anterior surface, wherein the posterior surface includes a substantially straight segment along the posterior surface for a majority of a substantially proximal to distal length of the post, and a bearing surface coupled with the post at the distal end of the post; and a femoral component comprising: a medial condylar section with a medial outer surface configured to engage the bearing surface of the one or more tibial components, a lateral condylar section with a lateral outer surface configured to engage the bearing surface of the one or more tibial components, wherein the medial condylar section and the lateral condylar section are disposed apart from one another to form an intercondylar notch, and a posterior cam that extends across the intercondylar notch between the medial condylar section and the lateral condylar section, wherein the posterior cam includes an anterior-distal surface configured to contact the posterior surface of the post, a posterior-proximal surface substantially opposite from the anterior-distal surface, and an intervening surface between the posterior-proximal surface and the anterior-distal surface configured to contact the posterior surface of the post, the anterior-distal surface having a first arcuate shape defining a first radius, the posterior-proximal surface having a second arcuate shape defining a second radius, and the intervening surface having a third arcuate shape defining a third radius, wherein proximal and distal relative to the one or more tibial components and relative to the femoral component refer to an orientation existing when the femoral component and the tibial component are aligned as the femoral component and the tibial component would be aligned if the femoral component were coupled with a femur and if the tibial component were coupled with a tibia and the femur and the tibia were oriented at approximately zero degrees of knee flexion-extension, wherein the femur is proximal and the tibia is distal, wherein the intervening surface of the posterior cam is configured to engage the substantially straight segment of the post of the one or more tibial components when the femoral component and the tibial component are aligned as the femoral component and the tibial component would be aligned if the femoral component were coupled with a femur and if the tibial component were coupled with a tibia and the femur and the tibia were oriented at approximately more than 90 degrees of knee flexion; wherein the intervening surface of the posterior cam is configured to engage the substantially straight segment of the post of the one or more tibial components when the femoral component and the tibial component are aligned as the femoral component and the tibial component would be aligned if the femoral component were coupled with a femur and if the tibial component were coupled with a tibia and the femur and the tibia were oriented at deep flexion of the knee, and wherein the post is configured to have inward rotation relative to the femoral component based on flexion of the one or more tibial components relative to the femoral component.