Methods1 DesignTo take cross-sectional longitudinal study with follow-up study of a combination of forward-looking approach.

研究方法1设计方案采取横断面纵向研究与前瞻性随访研究相结合的方法。

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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。

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Traditional craniotomy including pterional approach, subfrontal approach and longitudinal fissure approach was performed in the other patients.

其余均采用传统开颅手术，如翼点入路，额下入路、纵裂入路等。

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