Fig. 1

The ideal correction angle α60 was defined as the angle formed between the first line drawn from the lateral tip of intercondylar eminence to the ankle center, and the second line from the lateral tip of intercondylar eminence to the line passing through the 60% point of %MA, with the length the same as the first line (a). Measurement of lower limb alignment. FTA was defined as the lateral angle between the femoral anatomical shaft axis and tibial anatomical shaft axis. %MA was defined as the point where the mechanical axis intersects the tibial plateau, converted to a percentage from medial edge (0%) to lateral edge (100%) (b). MPTA was defined as the angle between the articular surface of the proximal tibia and the tibial mechanical axis. mLDFA was defined as the angle formed between the articular surface of the distal femur and the mechanical axis of the femur (c)