Fig. 2From: Association between changes in hip-knee-ankle angle and hindfoot alignment after total knee arthroplasty for varus knee osteoarthritisHKA angle measurement on a full-leg standing anteroposterior (AP) radiograph. HKA angle(a) was defined as the angle formed by the intersection of a line drawn from the center of the femoral head to the intercondylar fossa of the distal femur (green line) and a line drawn from the intercondylar spine of the proximal tibia to the center of the ankle joint (white line)Back to article page