Fig. 2

Rotational alignment axes for femoral and tibial component. The SEA axis (a and b): the line connecting the prominent point of lateral femoral epicondyle (a) and the medial femoral epicondylar sulcus (b). fPCL: the line tangent to the posterior border of the femoral posterior condyles. The Akagi line (c and d): the line connecting the midpoint of the posterior cruciate ligament insertion (c) and the medial border of the patellar tendon’s tibial attachment (d). MTTT (c and e): the line between the midpoint of the posterior cruciate ligament insertion (c) and the medial third of the tibial tuberosity (e)