Measurement for full‐length weight bearing radiograph. HKA is determined by measuring the angle between a line connecting point 1 (center of the femoral head) and point 2 (center of the knee), and a line connecting point 2 to point 3 (center of medial malleolus and lateral malleolus, center of point 4 and point 5); LDFA is the lateral angle between the MA and the joint line of the femur; MPTA is the medial angle between the MA and the joint line of the tibia