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. 2022 Jul 26;17:361. doi: 10.1186/s13018-022-03254-7

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Fig. 2 — The line connecting the posterior and lower edges of the C2 and C7 cervical vertebrae is line A, and the vertical lines from the posterior lower edge of the C3 to C6 vertebra to Line A are a1, a2, a3 and a4. CCI = (a1 + a2 + a3 + a4)/A * 100%