• Yasushi Fujiwara, Hideki Manabe, Takahiro Harada, Bunichiro Izumi, and Nobuo Adachi.
• Department of Orthopaedic Surgery, Hiroshima City Asa Citizens Hospital, Kabe-minami 2-1-1, Asakita-ku, Hiroshima, 731-0293, Japan. ys.fujiwara@nifty.com.
• Eur Spine J. 2017 May 1; 26 (Suppl 1): 170-177.

PurposePosterior cervical laminectomies and laminoplasties are common treatments for cervical spondylotic myelopathy. However, recent studies demonstrated that positional spinal cord compression occurred after cervical laminectomies and caused postoperative progressive myelopathy. Although there were no such reports after laminoplasties, we report two cases in which symptomatic extraordinary positional spinal cord compression occurred after laminoplasties in this paper.MethodsThis study included two patients who showed progressive myelopathy: one case after a laminectomy following failure of a single-door laminoplasty and one case after a double-door laminoplasty without interlaminar spacers.ResultsThe MRIs showed mild cord compression in the neutral position in both cases. However, the patients could not extend their necks, because it triggered severe neck pain and numbness. Therefore, the positional CT myelography (CTM) was taken in the flexion and extension positions, and it showed severe spinal cord compression only in the extension position. Posterior instrumented fusions were performed for both patients, which improved their symptoms.ConclusionsThis paper demonstrates that postoperative positional spinal cord compression during neck extension caused a progressive myelopathy even after laminoplasty. When myelopathy symptoms worsen after laminoplasties, we recommend positional CTM/MRI evaluation, even though there is no apparent cord compression in the neutral MRI.

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