Fig. 9From: The morphology of the femoral posterior condyle affects the external rotation of the femurThe relationship between the tibiofemoral rotation angle and the femoral rotation angle. Lines a and b depict the geometric center axis (GCA) in knee extension. Line c depicts the GCA in full knee flexion. As the femur becomes more internally rotated relative to the tibia in the knee extension (line a > line b), the external rotation angle of the femur increasesBack to article page