The knee

Figures 1 and 2: Frontal, side and back-view,  figures 3 to 5: Build-up of the knee (without menisci)

The degree of rotation in-between femur and tibia is under condition of maximal bending of the knee about 90 degree, in mid-position (right angel) about 45 degree, and 0 degree in the stretched position. (Note: Rotation of the foot under the condition of complete stretching of the knee is achieved by to rotation of the femur in relation to the hip.)