Fig. 4

The radiographic measurements taken from an anteroposterior long-standing view of the lower extremity.(A) The weightbearing line (WBL) ratio was defined as the ratio between the distance from the medial tibial edge to the tibial insertion of WBL (a) and the tibial width (b). The weight-loading line was measured from the medial side, with the medial tibial edge at 0% and the lateral tibial edge at 100%. (B) The hip-knee-ankle (HKA) was the lateral angle formed between the anatomic femoral axis and the anatomic tibial axis. (C) The medial proximal tibial angle (MPTA) was the medial angle formed between the mechanical tibial axis and the joint line of the proximal tibia