thoracolumbar junction
Also written as: TLJ — thoracolumbar junction
Anatomical transition zone between the thoracic and lumbar spine, typically encompassing T10-L2 vertebral segments.
Full Definition
The anatomical and biomechanical transition zone between the rigid thoracic spine and flexible lumbar spine, typically defined as the region from T10 to L2. This area represents a critical junction where the kyphotic thoracic spine transitions to the lordotic lumbar spine, creating significant biomechanical stress concentrations. The thoracolumbar junction is the most common site for traumatic spinal fractures due to the transition from the protected thoracic cage to the mobile lumbar spine. Surgical management of pathology in this region requires special consideration of the unique biomechanical properties and transition from costovertebral articulations to free-moving lumbar segments.
Usage
Usage note: Specify exact levels involved (T10-L2 is typical range) in documentation.
In Context
- "The burst fracture at the thoracolumbar junction required anterior reconstruction and posterior stabilization." — trauma case report
- "Degenerative changes at the thoracolumbar junction often require extended fusion constructs." — surgical planning