Interspinous ligament

The interspinous ligament is fibrous tissue connecting adjacent spinous processes. It contributes to the posterior support of a spinal segment and resistance to forward bending, working alongside other ligaments, joints and back muscles rather than providing stability independently.

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Structure and function

Interspinous ligaments occupy the spaces between neighbouring posterior bony projections. Their arrangement varies by region, and they blend with other supporting tissues, including the supraspinous ligament. They are not active motor tendons: their tension changes passively with position and loading while muscles contribute active control of the same region.

Possible manifestations

Substantial stretching can damage this part of the posterior ligament complex. Following a flexion injury, this possibility matters when assessing spinal stability. Pain between two bony prominences nevertheless cannot identify the ligament as the cause. Nearby muscles and joints may produce tenderness in a similar location, and a clinical test is not a direct view of the tissue.

Assessment and management

Assessment considers the mechanism, neurological symptoms and functional abilities. MRI can help evaluate ligament tissues in a relevant traumatic setting. An unusual signal should not be interpreted in isolation. Management depends on whether an injury is isolated or accompanies a fracture, and on the overall assessment of segment stability and healing requirements.

Role of TAGMED care

At TAGMED, a compatible mechanical presentation may lead to graded activity and appropriate symptom-focused care. Suspected disruption of the posterior ligament complex requires medical evaluation first. A manual technique cannot independently establish ligament strength or replace investigation of a potentially unstable injury.

Warning signs

After trauma, substantial pain with new weakness or numbness requires urgent assessment. Saddle numbness or new difficulty passing urine requires emergency evaluation. Avoid forceful forward bending to test a region that may have been injured.

Frequently asked questions

Does it connect vertebral bodies?

No. It connects the spinous processes behind the canal.

Is it the supraspinous ligament?

No. They have neighbouring but different positions.

Does pressure tenderness establish injury?

No. This finding is not sufficiently specific.

Is MRI routine?

No. Its value depends on context and the clinical question.

Must all activity stop?

No. Activity depends on diagnosis, stability and any restrictions.

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.