Fig. 8
From: The morphology of the femoral posterior condyle affects the external rotation of the femur
Relationship between spherical condylar angle and rotation angle. a The Spherical condylar angle can be likened to the angle between the axle and the ground. If the changed in knee flexion angle is the same, b) rotation angle is small when the approximate sphere of lateral posterior condyle is small. C rotation angle is large when the approximate sphere of medial posterior condyle is big