Fig.11. Nonspecific spondylitis of the thoracic spine: A - Spiral CT before operation; B - MRI before operation; C - the first stage of an operation - posterior internal fixation of the spine by distraction and contraction devices; D - the second stage of an operation - removal of a pathologic focus in vertebral bodies, anterior combined spondylodesis by M-31 biositall grafts and rib fragments.