Medially stabilising knee endoprosthesis

A knee endoprosthesis for total knee arthroplasty with preservation or with dissection of a posterior cruciate ligament, the knee prosthesis comprising:

• a femur part with a femur bearing surface, the femur part configured for fixation to a distal end of a femur with the femur bearing surface oriented distally;
• and
• a tibia part with a tibia bearing surface, the tibia part configured for fixation to a proximal end of a tibia with the tibia bearing surface oriented proximally,
• the femur bearing surface having a convex medial femur condylar bearing surface and a convex lateral femur condylar bearing surface,
• the tibia bearing surface having a concave medial bearing shell and a concave lateral bearing shell, the tibia bearing surface configured for accommodation and slidable on a slide bearing of the femur bearing surface without a fixed medial pivot of the femur bearing surface in the medial bearing shell,
• the medial bearing shell forming an asymmetric tibia bearing surface with the lateral bearing shell,
• the medial femur condylar bearing surface forming a non-asymmetric or quasi-symmetric femur bearing surface with the lateral femur condylar bearing surface,
• the medial femur condylar bearing surface and the lateral femur condylar bearing surface coinciding at least in an anterior femur condylar radius of respective anterior surface portions,
• the asymmetric tibia bearing surface forming an outside circumferential proximal elevation contour,
• the outside circumferential proximal elevation contour having an anterior elevation contour portion with at least one anterior elevation point and a posterior elevation contour portion with at least one posterior elevation point,
• the anterior elevation point is being proximally elevated relative to the posterior elevation point with respect to at least one sagittal plane, and
• an antero-medial elevation contour portion of the anterior elevation contour portion at the medial bearing shell forming a proximally most elevated anterior elevation point as an antero-medial apex point.