Abstract
Recent progress in image diagnosis technology enables us to detect numerous new findings for the diagnosis of ossification of the posterior longitudinal ligament (OPLL) and ossification of the ligamentum flavum (OLF). In most cases of cervical OPLL and thoracic OPLL/OLF, not only static compression, but also dynamic factors contribute to the development and aggravation of the myelopathy. The rationale for posterior decompression and fusion (PDF) surgery is to suppress the motion at the nonossified segment of OPLL by stabilization. The K-line is a simple and practical parameter with utility for decisions regarding the surgical approach to cervical OPLL. Sufficient posterior shift of the spinal cord and neurological improvement will not be obtained after laminoplasty in K-line (−) OPLL patients. Multicenter CT studies of ossification of the spinal ligament have been performed by the Japanese Research Group for Ossification of the Spinal Ligament to evaluate the prevalence of OPLL in the whole spine.
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