[Ossification of the posterior longitudinal ligament of the cervical vertebrae and myelopathy].

6 cases of OPLL of the cervical vertebrae (OPLL = Ossification of the Posterior Longitudinal Ligament), all diagnosed by CT or X-ray, are reported in this paper. With a review of relevant literature and clinical manifestations of the 6 patients, the incidence, clinical features, diagnosis, differential diagnosis of OPLL and the relationship between OPLL and myelopathy are discussed. It is pointed out that OPLL usually appears as a myelopathy.