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Compression Angle of Ossification of the Posterior Longitudinal Ligament and Its Clinical Significance in Cervical Myelopathy

Authors
 Nam Lee  ;  Do Heum Yoon  ;  Keung Nyun Kim  ;  Hyun Chul Shin  ;  Dong Ah Shin  ;  Yoon Ha 
Citation
 Journal of Korean Neurosurgical Society, Vol.59(5) : 471-477, 2016 
Journal Title
 Journal of Korean Neurosurgical Society 
ISSN
 2005-3711 
Issue Date
2016
Keywords
Cervical myelopathy ; Compression angle ; Ossification of the posterior longitudinal ligament
Abstract
OBJECTIVES: The correction of clinical and radiologic abnormalities in patients with symptomatic ossification of the posterior longitudinal ligament (OPLL) is the current mainstay of treatment. This study aimed to identify radiographic predictors of severity of myelopathy in patients with symptomatic OPLL. METHODS: Fifty patients with symptomatic cervical OPLL were enrolled. Based on Japanese Orthopedic Association (JOA) scores, patients were divided into either the mild myelopathy (n=31) or severe myelopathy (n=19) group. All subjects underwent preoperative plain cervical roentgenogram, computed tomography (CT), and MR imaging (MRI). Radiological parameters (C2-7 sagittal vertical axis, SVA; C2-7 Cobb angle; C2-7 range of motion, ROM; OPLL occupying ratio; and compression angle) were compared. Compression angle of OPLL was defined as the angle between the cranial and caudal surfaces of OPLL at the maximum level of cord compression. RESULTS: The occupying ratio of the spinal canal, C2-7 Cobb angle, C2-7 SVA, types of OPLL, and C2-7 ROM of the cervical spine were not statistically different between the two groups. However, the OPLL compression angle was significantly greater (p=0.003) in the severe myelopathy group than in the mild myelopathy group and was inversely correlated with JOA score (r=-0.533, p<0.01). Furthermore, multivariate regression analysis demonstrated that the compression angle (B=-0.069, p<0.001) was significantly associated with JOA scores (R=0.647, p<0.005). CONCLUSION: Higher compression angles of OPLL have deleterious effects on the spinal cord and decrease preoperative JOA scores.
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DOI
10.3340/jkns.2016.59.5.471
Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Neurosurgery (신경외과학교실) > 1. Journal Papers
Yonsei Authors
김긍년(Kim, Keung Nyun)
신동아(Shin, Dong Ah) ORCID logo https://orcid.org/0000-0002-5225-4083
윤도흠(Yoon, Do Heum) ORCID logo https://orcid.org/0000-0003-1452-5724
하윤(Ha, Yoon)
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URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/152517
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