Segmental motion at the peak of the ossification foci is independent risk factor except for mal-alignment and thick ossi
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(2020) 15:407
RESEARCH ARTICLE
Open Access
Segmental motion at the peak of the ossification foci is independent risk factor except for mal-alignment and thick ossification foci for poor outcome after laminoplasty for cervical ossification of the posterior longitudinal ligament: analyses in patients with positive K-line, lordotic alignment, and lower canal occupying ratio Junya Saito1, Masao Koda2* , Takeo Furuya1, Satoshi Maki1, Yasushi Ijima1, Mitsuhiro Kitamura1, Takuya Miyamoto1, Sumihisa Orita1, Kazuhide Inage1, Fumio Hasue3, Takayuki Fujiyoshi3, Koshiro Kamiya3, Yoshikazu Ikeda4, Fumitake Nakajima4, Mitsuhiro Hashimoto4, Hiroshi Noguchi2, Hiroshi Takahashi5, Masashi Yamazaki2 and Seiji Ohtori1
Abstract Purpose: To elucidate the independent preoperative factors that have a significant impact on poor surgical outcome after laminoplasty for K-line (+) ossification of the posterior longitudinal ligament (OPLL). Analyses in K-line (+) patient population can exclude the influence by mal-alignment and thick OPLL, both of which are well known two major factors that have significant impact on clinical outcome. Methods: The present study included 72 patients (50 male and 22 female) who underwent laminoplasty for K-line (+) cervical OPLL and were followed-up for at least 1 year. Recovery of Japanese Orthopedic Association score (JOA score) for cervical myelopathy was used as the measure of clinical outcome. For radiographic assessment, the type of OPLL, the maximum OPLL occupation ratio, the C2-C7 angle, and the segmental range of motion at the peak of OPLL (segmental ROM) were assessed. To elucidate the factors that are significantly associated with a poor clinical outcome after laminoplasty for K-line (+) OPLL, statistical analyses were conducted. (Continued on next page)
* Correspondence: [email protected] 2 Department of Orthopedic Surgery, University of Tsukuba, Tennodai, Tsukuba, Ibaraki 305-8575, Japan Full list of author information is available at the end of the article © The Author(s). 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in
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