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Updated: May 12, 2026

Anterior Cervical Discectomy and Fusion in the Ovine Model

Anterior Cervical Discectomy and Fusion in the Ovine Model

Published on: October 5, 2009

Does atlantoaxial dislocation influence the subaxial cervical spine?

Shenglin Wang¹, Peter G Passias, Libin Cui

¹Orthopaedic Department, Peking University Third Hospital, 49 North Garden Street, Haidian District, Beijing 100191, China.

European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society

|April 24, 2013

Summary

Atlantoaxial dislocation is linked to altered cervical spine alignment, causing diminished occipital-cervical lordosis and compensatory subaxial hyperlordosis, creating a "swan neck" deformity.

Related Experiment Videos

Last Updated: May 12, 2026

Anterior Cervical Discectomy and Fusion in the Ovine Model

Anterior Cervical Discectomy and Fusion in the Ovine Model

Published on: October 5, 2009

Area of Science:

Orthopedic Surgery
Spinal Deformity Research
Cervical Spine Biomechanics

Background:

The relationship between occipital-cervical and subaxial spine alignment is known in asymptomatic individuals.
Limited research exists on cervical alignment in patients with atlantoaxial dislocation.

Purpose of the Study:

To investigate the correlation between occipital-cervical junction and subaxial cervical spine alignment in patients with atlantoaxial dislocation.
To characterize the global cervical alignment in this specific patient population.

Main Methods:

A retrospective study of 298 patients with atlantoaxial dislocation and atlas occipitalization (2007-2011).
Measurement of Occiput-C2 and C2-C7 angles to assess cervical spine alignment.
Statistical analysis to evaluate the relationship between occipital-cervical and subaxial spine alignments.

Main Results:

Occiput-C2 angles ranged from -35.2° to 44.8°.
C2-C7 angles ranged from -17.4° to 77.8°.
A statistically significant negative correlation was found between Occiput-C2 and C2-C7 angles.

Conclusions:

Anterior atlantoaxial dislocations are associated with reduced occipital-cervical lordosis or kyphosis.
This leads to compensatory hyperlordosis in the subaxial cervical spine, forming a "swan neck" deformity.
Atlantoaxial dislocation significantly impacts overall cervical spine alignment.