ARTIFICIAL KNEE JOINT

摘要

An artificial knee joint includes a femoral component (1) and a tibial component (2). The femoral component (1) includes an intercondylar box (11). A cam (12) is provided on posterior of the intercondylar box (11). The tibial component (2) includes a medial condyle bearing surface (21) and a lateral condyle bearing surface (22) arranged on right and left side respectively.;A post (23) is provided between the medial condyle bearing surface (21) and the lateral condyle bearing surface (22). The post (23) is adapted to the intercondylar box (11). The post (23) has a first arc surface (231) on the lateral side of posterior surface. The post (23) has a second arc surface (232) on the posterior surface and on the medial side of the first arc surface (231). A third arc surface (121) and a forth surface (122), cooperating with the first arc surface (231) and the second arc surface (232), are provided on the cam (12) accordingly. The first arc surface (231) can cooperate with the third arc surface (121) so as to guide the femur to rotate laterally with respect to the tibia. The second arc surface (232) can cooperate with the forth surface (122) so as to resist the femur to rotate laterally with respect to the tibia. The artificial knee joint can simulate accurately the flexion-extension action of the knee joint, and is safe and reliable.

主权项

1. An artificial knee joint comprising a femoral component and a tibial component cooperating with each other and adapted to the femur and the tibia, respectively, wherein the femoral component includes an intercondylar box, and a cam is disposed at the posterior of the intercondylar box; the tibial component includes a medial condyle supporting surface and a lateral condyle supporting surface, a post is disposed between the medial condyle supporting surface and the lateral condyle supporting surface and cooperates with the intercondylar box, characterized in that a first arc surface is formed on the posterior-lateral surface of the post; a second arc surface is formed on the posterior-medial surface of the post, the cam is correspondingly provided with a third arc surface and a fourth arc surface cooperating with the first arc surface and the second arc surface, respectively; the first arc surface can cooperate with the third arc surface to guide an external rotation of the femur relative to the tibia; and the second arc surface can cooperate with the fourth arc surface to constrain the external rotation of the femur relative to the tibia.