Knee prosthesis

摘要

A knee joint prosthesis assembly according to the present disclosure can include a femoral component, a unitary tibial component, a medial bearing, and a lateral bearing. The femoral component can have a medial and a lateral condyle portion connected by a patellar track portion. The femoral component can form an opening between the medial and lateral condyles. The unitary tibial component can have a medial portion that includes a first posterior engagement lip and a first outer securing lip. The tibial component can further include a lateral portion that includes a second posterior engagement lip and a second outer securing lip. The medial bearing can have a first posterior groove formed thereon that selectively engages the first posterior engagement lip and a first outer groove that selectively engages the first outer securing lip.

主权项

1. A knee joint prosthesis assembly comprising:
a femoral component having a medial and a lateral condyle portion connected by a patellar track portion, the femoral component forming an opening between the medial and lateral condyles; a unitary tibial component having a medial portion that includes a first posterior engagement lip and a first outer securing lip extending superiorly from a base surface at a medial end of the unitary tibial component, and a lateral portion that includes a second posterior engagement lip and a second outer securing lip extending superiorly from the base surface at a lateral end of the unitary tibial component, the first and the second outer securing lips are posterior to an anterior edge of the unitary tibial component, the first and the second posterior engagement lips are separate and spaced apart from one another and extend superiorly from the base surface; a medial bearing configured to be slid into cooperation with the medial portion of the unitary tibial component such that a first posterior groove formed on the medial bearing slidably engages the first posterior engagement lip and a first outer groove formed on the medial bearing at a medial side thereof slidably engages the first outer securing lip; a lateral bearing separately formed and independent from the medial bearing and configured to be slid into cooperation with the lateral portion of the unitary tibial component such that a second posterior groove formed on the lateral bearing slidably engages the second posterior engagement lip and a second outer groove formed on the lateral bearing at a lateral side thereof slidably engages the second outer securing lip; and a locking bar configured to couple with a track of an anterior engagement bridge extending from a superior surface of the unitary tibial component between the medial and lateral portions thereof, and configured to couple with the medial and lateral bearings to secure the medial and lateral bearings to the tibial component.