The vertebrae numbered T1 to T12 form the upper part of the spine, called the thoracic spine. These vertebrae form the base of the powerful spinal column of the thoracic region that supports the top of the spine, the rib cage, soft tissues, flexible joints, blood vessels, and nerves. There is a reduction in the height of the vertebrae due to compression fractures, as the name suggests.
Most commonly occurs in the middle spine (thoracic spine), especially in the lowermost vertebrae (T11/T12).