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. 2022 Jun 16;10:918032. doi: 10.3389/fbioe.2022.918032

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Copyright © 2022 Liang, Han, Hai, Yang and Yin.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Changes of IDP of non-fused segments in the ACDF model with increasing total C0–C7 ROM and the final reasonable total C0–C7 ROM was calculated (A) IDP values of C2/3, C3/4, C4/5, and C6/7 levels change with the increasing total C0–C7 ROM in the ACDF model. (B) ROMs were calculated with IDP constraints in the ACDF model, and the minimum ROM in each motion direction was labeled*. (C) Reasonable total C0–C7 ROM with FJF and IDP constraints was shown. Note: changes (%) = (ACDF model value—intact model value)/intact model value × 100%.