Abstract
Recently, much attention has been paid to thoracic spondylotic myelopathy. One of the local factors which produce spondylotic changes could be the movability of the thoracic spine.
Dynamic studies on 100 normal persons, equally chosen from a group of persons age 10 to 70 showed that movability of flexion-extension is the minimum at the level of sixth to seventh thoracic spine and becomes larger as the level goes up to cephalad or down to caudal direction. The level of eleventh to twelveth thoracic spine has greatest movability in both flexion-extension and lateral bendings and is up to three to five times more movable than the level in which the movability is smallest.
