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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. 3. — Cervical OPLL type. (A) Ossification categorization of the posterior longitudinal ligament into continuous (a), segmental (b), mixed (c), and other types (d) based on lateral radiographs of the cervical spine. (B) A classification system for ossification of the cervical spine's posterior longitudinal ligament based on the morphology of the motor segment’s ossification block. (a) Nonbridge formation. (b) Stable plate. (c) Stable beak. (d) Unstable upper-plate. (e) Unstable lower-plate. (f) Unstable-beak. OPLL, ossification of the posterior longitudinal ligament.