Ligamentum Flavum — Atlantoaxial Level

ligamentum flavum — C1-C2

The ligamentum flavum at the C1-C2 level is the posterior capsular ligamentous complex between the C1 and C2 laminae, providing the posterolateral C1-C2 joint closure and yellow ligament equivalent at this transitional level.

Region: Neck

Biomechanics

Function & Actions

Provides elastic posterior C1-C2 constraint, assists return of the atlantoaxial joint to neutral after rotation, and forms the posterior boundary of the epidural space at C1-C2.

Clinical Relevance

Clinical Notes

Hypertrophy of the C1-C2 ligamentum flavum equivalent contributes to upper cervical canal stenosis. In posterior C1-C2 fusion, the interlaminar ligament complex is removed to allow bone graft placement. The C1-C2 epidural space at this level is used for upper cervical epidural injection.

Pathology

Common Injuries & Conditions

C1-C2 Flavum Hypertrophy in Upper Cervical Stenosis

Ligamentum flavum thickening at the atlantoaxial level contributing to posterior canal narrowing, addressed by posterior decompression during C1-C2 stabilisation surgery.