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Fig. 1. A graphical representation of the optimized right knee joint center (KJC)
observed from an anterior aspect. Planes 1 and 2 are defined by a point on the
helical axis and the midpoint of the transepicondylar vector. The KJC is the
average of the points on the helical axis intersected by planes 1 and 2. The
distance between the transepicondylar vector and the helical axis in this
figure is not to scale.