Usefulness of K-line in predicting prognosis of laminoplasty for cervical spondylotic myelopathy

BMC Musculoskeletal Disorders

Research Article

Terumasa Ikeda¹  Hiroshi Miyamoto¹  Masao Akagi¹ 

[1] Department of Orthopedic Surgery, Kindai University Hospital, Ohno-Higashi, Osaka-Sayama, Japan;

关键词: Cervical spondylotic myelopathy;    K-line;    Cervical spinal kyphosis;   

DOI  :  10.1186/s12891-023-06214-2

 received in 2020-07-16, accepted in 2023-01-31,  发布年份 2023

来源: Springer

【 摘 要 】

BackgroundK-line is widely recognized as a useful index for evaluating cervical alignment and the size of the cervical ossification at the posterior longitudinal ligament (OPLL). The purpose of this study was to investigate whether the K-line could be a useful clinical tool for predicting the prognosis of laminoplasty (LP) for cervical spondylotic myelopathy (CSM).MethodsAdult CSM patients scheduled for cervical LP were recruited for this study. C2-7 angle, local kyphosis angle, and K-line was evaluated by T2-weighted sagittal magnetic resonance imaging (MRI). Clinical findings were evaluated by the JOA score and the recovery rate. Clinical and radiological findings were evaluated preoperation and final follow-up. Patients were grouped into K-line ( +) and K-line (-). Patients with Kline (-) were further divided into two sub-groups: disc type (anterior cord compression due to disc protrusion with kyphosis) and osseous type (due to osseous structure such as osteophyte).ResultsSixty-eight patients were included in the analysis. The recovery rate of K-line (-) group (n = 11,19.4%) was significantly worse than that of K-line ( +) group (n = 57, 50.6%, p<0.05). Among 11 K-line (-) patients, 7 were disc type and 4 were osseous type. Over the period of follow-up, the disc type K-line (-) patients changed to K-line ( +) and showed significantly better recovery rate (27.6%) compared to the osseous type K-line (-) group (5.0%, p < 0.05).ConclusionThe present of this study indicate that K-line may have a predictive value for clinical outcome in patients undergoing LP for CSM. K-line (-) of osseous type was worse than k-line (-) of disc type.

【 授权许可】

CC BY   
© The Author(s) 2023

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