| 摘要 |
A three-component knee joint prosthesis (1) is disclosed including femoral, tibial and patellar components (7, 3, 5). During flexion of the prosthetic knee, the patellar component (5), which has a convex bearing surface (51), cooperates with and is guided by a patellar track (57) defined by the anterior plate portion (25), lateral condylar bearing portion (9) and medial condylar bearing portion (11) of the femoral component (7) and a web portion (31) joining the two femoral condylar bearing portions (9, 11). The inner regions of the two femoral condylar bearing portions (9, 11) are steeply sloped towards the web portion (31) to permit the patellar component (5) to "ride deeply" upon the femoral component (7) at high degrees of flexion, thereby reducing quadriceps tension and expanding the permissible range of motion in flexion. |
