Insert for use in a knee prosthesis

A knee prosthesis comprising:

• a femoral component including a medial condylar surface, a lateral condylar surface, and an articular surface;
• a tibial component including a load bearing component;
• and
• an insert positioned between the articular surface and the load bearing component, the insert including an anterior surface, a posterior surface, a medial surface, a lateral surface, a medial component, and a lateral component, wherein:
• the medial component includes a top surface arranged and configured to contact the medial condylar surface, the top surface of the medial component including a medial sulcus point;
• and
• the lateral component includes a top surface arranged and configured to contact the lateral condylar surface, the top surface of the lateral component including a lateral sulcus point;
• wherein:
• the medial sulcus point is positioned closer to the posterior surface than to the anterior surface;
• the medial sulcus point is positioned closer to the posterior surface of the insert than the lateral sulcus point;
• the lateral sulcus point is positioned closer to the anterior surface than to the posterior surface;
• and
• the lateral sulcus point is positioned more anteriorly than the medial sulcus point by approximately 10 to 35 percent an overall distance between the posterior and anterior surfaces;
• wherein the top surface of the medial component includes a concave surface that extends completely from the posterior surface to the anterior surface, and the top surface of the lateral component includes a compound curve having at least a segment thereof including a convex surface;
• wherein the compound curve of the top surface of the lateral compartment includes an anterior concave segment and a posterior concave segment;
• wherein the medial component includes an anterior lip having a height HA as measured from the medial sulcus point to a tip of the anterior lip, and a posterior lip having a height Hp as measured from the medial sulcus point to a tip of the posterior lip, where height HA is greater than height Hp.