Radial bone mineral density in ossification in the posterior longitudinal ligament in the cervical spine.

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Radial bone mineral density (BMD) in the distal 1/6 and 1/3 sites of the radius was measured by single photon absorptiometry in forty-one patients with ossification of the posterior longitudinal ligament (OPLL) in the cervical spine.In the cross-sectional study, values of BMD in the cervical OPLL showed no differance from those of age, sex-matched control.In the longitudinal study, follow-up values of 1/6 BMC/BW in the cervical OPLLadvancing group decreased significantly than initial values of it. Follow-up values of trabeculo-cortical ratio (1/6/1/3 ratio of BMC/BW) in the cervical OPLL-advancing group decreased significantly compared with the cervical OPLL non-advancing group.These results suggest that in the OPLL-advancing period, trabecular bone mass is decreasing and cortical bone mass is kept. We speculate that unknown factors force shift of trabecular bone mass to ossification sites.
西日本整形・災害外科学会の論文