[Progression of Paget's disease of the spine 10 years following posterolateral spondylodesis].

M. Paget is regarded as a disease confined to the bone. Its chief characteristics are increased bone metabolism with accelerated bone reduction and precipitate bone reconstruction. One of the most common sites of the disease is the lumbar spine. Encroachment of Paget's disease from the third lumbar body to the neighbouring spinal structures is described 10 years after a lumbar spondylodesis.