What does the anterior longitudinal ligament limit?

The anterior longitudinal ligament plays a crucial role in maintaining spinal stability and is primarily responsible for limiting extension of the spine. This ligament runs along the anterior aspect of the vertebral bodies and intervertebral discs from the sacrum to the base of the skull. It provides support by resisting excessive backward bending (extension) of the vertebral column, thereby protecting the spine from hyperextension injuries.

Understanding the function of the anterior longitudinal ligament is essential in clinical practice, particularly when addressing conditions that involve spinal stability and alignment. When patients experience spinal issues, clinicians must assess the integrity of the ligaments and the range of motion of the spine, especially concerning extension capabilities.

The other options refer to movements that are less directly influenced by the anterior longitudinal ligament. Flexion is not significantly restricted by this ligament, while rotation and lateral bending are primarily controlled by other structures such as the facet joints and surrounding musculature. Thus, identifying the role of the anterior longitudinal ligament in limiting spinal extension specifically helps to clarify the overall biomechanics of the spine and informs treatment approaches in physical therapy.