Fig. 1
From: Neutral boundary alignment in total knee arthroplasty: a novel concept
a Hip, knee, ankle coronal radiograph taken in midstance of gait for the right leg, which was obtained with the patient taking one-step forward and pausing for X-ray (static capture). The contact boundaries are defined in this view. b Based on six points representing the contact boundaries of femur and the tibia, the iterative algorithm of structural layout patterns of truss is applied. c A truss model is generated for the femur and tibia. d The NB Axis is defined by a line L connecting the intersecting points P1 and P2 and the joint line J perpendicular to NB Axis