Prosthetic condylar joints with articulating bearing surfaces having a translating contact point during rotation thereof

摘要

A prosthetic joint according to the present invention includes a first implant component for attachment to a first bone and a second implant component for attachment to a second bone. The first implant component has a condylar portion that includes first and second condylar bearing surfaces and similarly, the second implant component has bearing surfaces that receive and are complementary to the first and second condylar bearing surfaces. Each of the first and second condylar bearing surfaces and each of the bearing surfaces of the second implant component has a cross-section in a coronal plane that exhibits two different radii and a contact point is established between the first and second condylar bearing surfaces and the bearing surfaces of the second implant component. The bearing surfaces of the respective implant components are configured such that varus and valgus rotation of the first implant component relative to the second implant component causes the contact point to move outwardly.

主权项

1. A prosthetic joint comprising:
a first implant component for attachment to a first bone, the first implant component having a bicondylar portion that includes first and second condylar bearing surfaces, wherein each of the first and second condylar bearing surfaces has a convex shape; and a second implant component for attachment to a second bone, the second implant component having bearing surfaces that receive and are complementary to the first and second condylar bearing surfaces; wherein each of the first and second condylar bearing surfaces and each of the bearing surfaces of the second implant component has a cross-section in a coronal plane that exhibits at least two different radii and a contact point is established between the first and second condylar bearing surfaces and the bearing surfaces of the second implant component, the at least two different radii of each respective condylar bearing surface defining the convex shape of the respective condylar bearing surface; wherein varus and valgus rotation of the first implant component relative to the second implant component causes the contact point to move laterally (outwardly) away from a center of the joint when the second implant component is in near full extension relative to the first implant component.