| 摘要 |
A knee prosthesis and method for use are provided, in which the knee prosthesis provides anterior and posterior stability and controlled femoral roll-back, while also providing rotational kinematics. The femoral component (12) has a pair of convexly shaped condyles (84,86) which are spaced apart to form an intercondylar notch (88). Anterior and posterior cams (100,102) are provided within the notch. The tibial component comprises a platform (16) upon which a tibial bearing (20) is mounted to provide for rotational movement about the tibial axis. The tibial bearing is provided with surfaces to engage the condyles and has an upwardly extending spine which is positioned to engage the anterior and posterior femoral cams. At full extension, the spine engages the anterior femoral cam to provide a 3 DEG hyperextension stop. Between full extension and approximately 50 DEG of flexion, the spine is free to translate between the anterior and posterior femoral cams. From 50 DEG to 120 DEG of flexion, the spine engages the posterior femoral cam, which provides femoral roll-back and posterior stability.
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