The thoracic intertransverse ligaments connect adjacent thoracic transverse processes, providing lateral segmental constraint. They are rounded cords unlike the flat membranes of the lumbar region.
Limit lateral bending of the thoracic spine, contribute to the stiffness of the thoracic spine in lateral flexion compared to the more mobile lumbar and cervical regions, and are part of the posterior tension band complex.
Thoracic intertransverse ligaments are divided during thoracic transpedicular approaches and posterior thoracic osteotomies. Their disruption as part of a three-column injury contributes to thoracic instability requiring posterior instrumented fusion.
Lateral thoracic instability from intertransverse ligament rupture in flexion-distraction injuries requiring posterior instrumented stabilisation.
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