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. 2023 Jun 30;20(2):651–661. doi: 10.14245/ns.2346124.062

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Copyright © 2023 by the Korean Spinal Neurosurgery Society

This is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Fig. 1. — Static compression factors. (A) The red line represents the K-line, which was defined as the midpoint of the C2 and C7 spinal canals. The yellow line signifies the C2–7 Cobb angle. Pane B depicts the relevant computed tomography (CT) parameters measured in OPLL patients. a=the OPLL diameter. a/b=occupying ratio. b-a=space available for the spinal cord. c=OPLL angle. (C) Measurement of CT transverse section of the cervical spine. The left panel represents the central type, while the right panel represents the lateral differentiated type; the red area represents the space available for the spinal canal's transverse section. OPLL, ossification of the posterior longitudinal ligament.