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. 2023 Jan 3;31(4):1483–1490. doi: 10.1007/s00167-022-07302-x

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Fig. 2 — Right bone model in different positions, lateral view (blue: reference zero position; white: flexed/rotated model); a zero position; b 15° external rotation; c 10° flexion; d 30° flexion with 15° internal rotation