CONSTRAINED KNEE PROSTHESIS

摘要

A tibial insert includes a base and a post extending from the base along a longitudinal axis. The post has a medial surface, a lateral surface, and a height along the longitudinal axis. The medial surface has a medial section, and the lateral surface has a lateral section oriented substantially parallel to the medial section. The medial section and the lateral section each have a width in a substantially anterior-posterior direction that is sufficient to enable varus/valgus constraint over a flexion/extension range from extension to about 90 to 120 degrees of flexion when the tibial insert is mated with a femoral component.

主权项

1. A prosthesis comprising:
a femoral component that defines an opening between substantially parallel inner walls; and a tibial insert having a base and a post extending from the base, the post having a medial surface and a lateral surface and being configured to be received in the opening,
the medial surface having a medial section, and the lateral surface having a lateral section oriented substantially parallel to the medial section,the medial section and the lateral section each having a width in a substantially anterior-posterior direction that is sufficient to constrain varus/valgus alignment of the prosthesis over a flexion/extension range from extension to about 90 to 120 degrees of flexion when the tibial insert is mated with the femoral component such that the post is received in the opening and the medial section and the lateral section each engage one of the substantially parallel inner walls, wherein engagement of the tibial insert and the femoral component rotates the tibial insert relative to the femoral component over at least a portion of the constrained flexion/extension range.