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. 2019 Nov 19;11(6):1054–1063. doi: 10.1111/os.12553

Figure 1.

Figure 1

X‐ray lateral cervical spine in neutral position showing various angles. Occipitoaxial angle (OC2A): Angle between McGregor line (A line) and the line (B line) tangential to the inferior aspect of the axis. Posterior occipitocervical angle (POCA): Angle formed by the intersection of a line (C line) drawn tangential to the flat posterior aspect of the occiput between the foramen magnum and occipital protuberance and the line (D line) determined by the posterior aspect of the third and fourth cervical facets. Cervical spine angle (CSA): Angle between the posterior aspect of vertebral bodies of C2 (E line) and C7 (F line).