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Comparison of the ROM in the intact model and the ACDF model under the same displacement (A) Displacement load was applied to the ACDF model under a 73.6 N follower load resulting in a total C0–C7 ROM same as that of the intact model. (B,C) Total ROMs of the upper (C0–C3) and the lower (C3–C7) cervical spine (D–I) and the intervertebral ROMs of C0–C7 in the six motion directions was shown. Note: changes (%) = (ACDF model value—intact model value)/intact model value × 100%.
