Posterior longitudinal ligament

The posterior longitudinal ligament runs along the back of vertebral bodies and discs inside the spinal canal. Positioned in front of the neural coverings, it contributes to spinal stability and helps restrain excessive forward bending movements.

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Structure and function

Posterior describes its relationship to the vertebral bodies, not a position behind the spinal cord. This fibrous band spans multiple levels and has close relationships with the discs. It belongs to a support system that also includes other ligaments, joints and muscles rather than controlling stability on its own.

Possible manifestations

Traumatic disruption may affect stability depending on its extent and associated injuries. Ossification of the ligament can reduce canal space, particularly in the neck. It may remain asymptomatic. When spinal cord compression develops, hand clumsiness, walking difficulty or weakness can become important findings, although these symptoms also have other possible causes.

Assessment and management

Neurological examination looks for a compatible cord or nerve-root pattern. CT defines ossification, while MRI assesses effects on neural tissues. Decisions depend on clinical agreement and progression. Significant compression may require surgical assessment, but not every radiological finding requires an operation. Symptoms and function matter alongside the size and location of the abnormality.

Role of TAGMED care

At TAGMED, a report mentioning this ligament must be interpreted within the diagnosis. Suspected myelopathy or instability requires medical referral before mechanical care. Physical treatments do not remove ossification or guarantee widening of the canal, and they should not delay assessment of progressive neurological impairment.

Warning signs

Progressive weakness, deteriorating walking or new urinary dysfunction accompanying spinal symptoms requires urgent evaluation. Rapid deterioration warrants emergency assessment rather than waiting through several treatment sessions or assuming the problem is ordinary stiffness.

Frequently asked questions

Is it behind the spinal cord?

No. It is behind the bodies but in front of the neural coverings.

Is it the ligamentum flavum?

No. That ligament joins laminae farther posteriorly.

Does ossification mean a tumour?

No. It describes bone formation within the ligament.

Should a symptom-free finding be discussed?

Yes, to clarify its significance and any monitoring.

Does traction dissolve ossification?

No. That claim is unsupported.

Educational information from The Spine Page. This entry does not replace an individual assessment. Documentary version: October 12, 2026. Sylvain Desforges, B.Sc., D.O., N.D., osteopath and naturopath.