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後縦靭帯骨化症
Ossification of the posterior longitudinal ligament
後縦靭帯(ligament)が骨化(ossification)した結果、脊柱管が狭くなり神経の根元が押されて感覚障害(sensory disorder, sensory disturbance)や運動障害(dyskinesia)などの神経症状を引き起こす病気のこと。
As a result of the ossification (the hardening into a bony substance) of the posterior longitudinal ligament, the spinal canal becomes narrow and the nerve roots are pressed, which causes neurological symptoms such as sensory disorders and/or dyskinesia (involuntary, erratic, writhing movements of the face, arms, legs or trunk), etc.