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Selection of fusion cage. (A) Customized fusion cage was selected according to the pre-ML distance, articular surface length, and the expected post-Oc–C2A. (B) Representative cage with 6 mm of height, 18 mm of length, and 5° of fusion angle. (C) Representative cage with 8 mm of height, 18 mm of length, and 5° of fusion angle. (D) Representative cage with 10 mm of height, 18 mm of length, and 5° of fusion angle. ML, McRae’s line.
