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Ossification of the posterior longitudinal ligament of the spine

Department of Diagnostic Radiology, Singapore General Hospital, Outram Road, Singapore 3

C. L. Oon, M.B., B.S., D.M.R.D., F.R.C.R.

X-ray Clinic, Singapore Medical Centre, Singapore 10

"The Japanese disease" or ossification of the posterior longitudinal ligament of the cervical spine was initially thought to affect only the Japanese people. Non-Japanese Asian and Caucasian cases have been reported but appear to be exceedingly rare. The reason is unknown. Although the disease appears to be generally benign, it can cause a myelopathy. We present here 16 non-Japanese patients in Singapore who were found to have ossification of the posterior longitudinal ligament in the cervical, thoracic and lumbar spine.

Received for publication November 1, 1978. Revision received April 1, 1979.

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