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(A) Definition of the tibial coordinate system and femoral flexion axes for measurements of femoral condyle translations. (B) Determination of tibiofemoral articular cartilage contact points by the centroid of the overlapping areas of the tibiofemoral cartilage surfaces. (C) Measurements of femoral condyle translations and axial rotations on the tibial coordinate plane using the projections of the femoral condyle axes.
