Abstract: 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.

Abstract: An artificial disc includes an upper joint (3) and a lower joint (7) which fit each other in a corresponding upper and lower relationship, and a removable fixed connection structure for fixedly connecting the upper joint (3) and the lower joint (7).

Abstract: An artificial intervertebral disc includes an upper joint (3) and a lower joint (7) configured according to the corresponding upper and lower positions, and which includes a removable fixing structure which makes a permanent connection between the upper joint (3) and the lower joint (7).