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An example of tibial bottom extension. (A,B) Circles drawing before extension. (C,D) Circles drawing after extension. Green circle: cranial circle. Red circle: caudal circle. On (A,C), the green line is the MRI-LA. On (B,D), the purple line is the MRI-LA and the green line is its orthogonal. MRI-LA, MRI-longitudinal axis; MRI, magnetic resonance imaging.
