Effect of K-line on posterior cervical surgery in patients with posterior longitudinal ligament ossification
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ORIGINAL ARTICLE
Effect of K‑line on posterior cervical surgery in patients with posterior longitudinal ligament ossification Cheng Li1 · Hong Zhou1 · Sen Yang1 · Xuanchen Zhu1 · Guochun Zha2 · Zhi Yang2 · Feng Yuan2 · Weimin Jiang1 Received: 12 January 2020 / Revised: 14 May 2020 / Accepted: 13 June 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Purpose To evaluate the effect of K-line on posterior single-door decompression with fusion fixation (PFF) and posterior single-door decompression with non-fusion fixation (PNF) for patients with ossification of posterior longitudinal ligament (OPLL). Methods A total of 65 patients with OPLL were analyzed retrospectively. They consisted of 44 patients with positive K-line, designated as the K ( +) group, and 21 patients with negative K-line, designated as K (−). The patients were also divided into a PFF group (38 patients) and a PNF group (27 patients). The Japanese Orthopaedic Association (JOA) score, C2–C7 Cobb angle, improvement rate of JOA score, and complications were calculated and statistically analyzed between the groups. Results In the K ( +) group, there were no significant differences in the incidence of C5 nerve root palsy and C2–C7 Cobb angle between the two groups of surgical patients, but there were significant differences in the improvement rate of JOA score and the incidence of axial pain. In the K (−) group, there were no significant differences in the incidence of axial pain, the incidence of C5 nerve root palsy, and preoperative C2–C7 Cobb angle between the two groups, but significant differences were observed in the improvement rate of JOA score and C2–C7 Cobb angle at the last follow-up. Conclusion In the K ( +) group, the improvement rate of JOA score was higher and the incidence of axial pain was lesser in the PNF group than in the PFF group. In the K (−) group, the improvement rate of JOA score was higher in the PFF group than in the PNF group, and there was significant loss of C2–C7 Cobb angle in the PNF group. Keywords Ossification of posterior longitudinal ligament · Single open-door laminoplasty · K-line · Complications
Introduction Ossification of posterior longitudinal ligament (OPLL) is a pathological condition characterized by heterotopic ossification of the cervical spinal ligament, which can lead to spinal stenosis and compression of the spinal cord, which in turn result in limb numbness and weakness, walking difficulties, and other clinical manifestations. Cervical OPLL was first reported in 1984 by Tsuyama [1]. Since then, research has increasingly been conducted on the condition. OPLL is a * Weimin Jiang [email protected] 1
Department of Orthopedics, The First Affiliated Hospital of Soochow University, 899, pinghai road, Suzhou 215006, Jiangsu Province, China
Department of Orthopedics, The Affiliated Hospital of Xuzhou Medical University, Xuzhou 221006, Jiangsu Province, China
2
common cause of myelopathy in individuals over 55 years of age [2, 3]. Cervical OPLL is most common in men,
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