Importance

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Abstract

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 has a pair of convexly shaped condyles which are spaced apart to form an intercondylar notch. Anterior and posterior cams are provided within the notch. The tibial component comprises a platform upon which a tibial bearing 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. The posterior surface of the upwardly extending spine is arranged coincident with the tibial axis. At full extension, the spine engages the anterior femoral cam to provide a 3.degree. hyperextension stop. Between full extension and approximately 50.degree. of flexion, the spine is free to translate between the anterior and posterior femoral cams. From 50.degree. to 120.degree. of flexion, the spine engages the posterior femoral cam, which provides femoral roll-back and posterior stability.

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First Claim