Analysis of bone mineral contents of patients with ossification of cervical posterior longitudinal ligament.

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Pathogenesis of ossification of cervical posterior longitudinal ligament (OPLL) has not been well clarified yet.The purpose of this paper is to evalute calcium metabolism in patients with OPLL, using the bone mineral analyzer (single photon absorption technique).Bone mineral contents were examined in 27 cases of OPLL. There were 15 males and 12 females, and their mean age was 52 years with a range from 42 to 74.107 healthy people, 51 males and 56 females, were selected as a cotrol group, matching the averageage as much as possible.Results were as follows:The bone mineral content tends to be higher in the group of OPLL, compared with the control group, and it was significantly higher if only the asymptmatic patients were selected.The period of myelopathy could sffect the bone mineral contents.