Kummell's disease is a spinal disorder characterized by delayed post-traumatic 
collapse of a vertebral body with avascular necrosis. Although definitive 
treatment for Kummell's disease has not been established, it has been reported 
that percutaneous vertebroplasty or kyphoplasty has shown good results. However, 
these procedures are not recommended for severely collapsed vertebral bodies 
because of the risk of cement leakage or technical difficulties. Authors report 
a rare case of spontaneous reduction in vertebral height by the insertion of a 
working cannula into the vertebral body in Kummell's disease.