A 48 year old woman. Her early complaint was difficulty in walking. One year previously the patient first complained low back pain. These complaints increased gradually, being accompanied by sensory disturbances of the lower extremities. Two months later she felt clumsiness in the legs and gradually became incapable of standing.
On X-ray and surgical findings broad ossification of the posterior longitudinal ligament were observed mainly in the thoracic and also in the lumbar region being accompanied by those of other spinal ligaments, such as anterior and interspinous ligament, as well as ligamenta flava.