Co-existence of ossification of the nuchal ligament is associated with severity of ossification in the whole spine in patients with cervical ossification of the posterior longitudinal ligament -A multi-center CT study

Journal of Orthopaedic Science : Official Journal of the Japanese Orthopaedic Association
Toshitaka YoshiiYoshiharu Kawaguchi

Abstract

Previous studies have shown that patients with cervical ossification of the posterior longitudinal ligament (OPLL) often have co-existing ossification of the nuchal ligament (ONL). However, no studies have focused on ONL and its relevance to the severity of OPLL or ossification of other spinal ligaments, such as anterior longitudinal ligament (OALL), ligamentum flavum (OLF), and supraspinous/interspinous ligament (OSIL). In this multicenter study, we investigated ossification of the spinal ligaments in the whole spine computed tomography (CT) images of 233 cervical OPLL patients. The severity of ossification was evaluated using ossification index for each spinal ligament, calculated as the sum of the level of ossification. We compared the severity of ossification in each spinal ligament between patients with ONL and those without ONL. Furthermore, we investigated how the number of segments, where ONL exists, affects the severity of ossification in each spinal ligament. One hundred thirty patients (55.8%) had co-existing ONL in the cervical OPLL patients included in this study. The ONL (+) group included more male and aged patients. The cervical ossification indexes of OPLL and OALL were higher in ONL (+) patients than in ONL (-...Continue Reading

Citations

Jun 8, 2021·Journal of Orthopaedic Science : Official Journal of the Japanese Orthopaedic Association·Kanji MoriYoshiharu Kawaguchi
Aug 8, 2021·Journal of Clinical Medicine·Takashi HiraiHiroaki Nakashima
Dec 19, 2020·Journal of Orthopaedic Science : Official Journal of the Japanese Orthopaedic Association·Kazuyoshi KobayashiShiro Imagama

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