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A standardized method to describe spatial position of any straight line close to the knee joint. (A–D) The sagittal planes of the TEA medial/lateral ends were determined with the distal femur anatomy. (E,F) 2D coordinate systems were established in the sagittal planes. The unit length can be millimeter (sagittal-mm coordinate system) or bicondylar width (sagittal-BCW coordinate system).
