Fig. 6
From: The morphology of the femoral posterior condyle affects the external rotation of the femur
Passing point of the weight-bearing line on the tibial surface plane. (1) the origin of the tibial coordinate system, (2) the most medial point on the medial tibial surface, (3) the most lateral point on the lateral tibial surface, (4) the most anterior point on the tibial surface, (5) the most posterior point on the tibial surface of the medial and lateral tibial surface planes. The medial and lateral tibial surface planes consist of (1),(2),(4),(5) and (1),(3),(4),(5), respectively