Study Design. To report a new index, the K-line, for deciding the surgical approach for cervical ossification of the posterior longitudinal ligament (OPLL).
研究目的：证实k线作为颈椎后纵韧带骨化手术入路的新标准。
2
Objective To evaluate the effect of lower cervical instability on the onset of cervical ossification of the posterior longitudinal ligament (OPLL).
目的探讨下颈椎不稳与颈椎后纵韧带骨化症(OPLL)早期发病的关系。
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Purpose to evaluate the imaging feature of cervical cord compression due to the ossification of posterior longitudinal ligament.