| 主权项 |
1. A knee joint endoprosthesis, comprising:
a femur component and a tibia component, which comprise cooperating joint surfaces that are in contact with one another, a rotation guide arrangement for forcing a rotational movement of the femur component and the tibia component relative to each other about a medial center of rotation due to a flexural movement of the knee joint endoprosthesis, which rotation guide arrangement comprises a first guide element having a first guidance surface and a second guide element having a second guidance surface which cooperates with the first guidance surface, wherein:
a projection of the tibia component comprises the first guide element,a transverse extension connecting condyles of the femur component comprises the second guide element,the first guidance surface defines a first radius of curvature,the second guidance surface defines a second radius of curvature,the first and second radii of curvature are identical,the second guidance surface is defined by a section of an outer surface of a thread which has a rounded thread root having a thread-root radius which corresponds to the first radius of curvature,a pitch of the thread establishes an extent of a forced transverse movement of the femur component relative to the tibia component during the flexural movement. |
