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Copyright ©The Author(s) 2015.
World J Orthop. Mar 18, 2015; 6(2): 236-243
Published online Mar 18, 2015. doi: 10.5312/wjo.v6.i2.236
Figure 1
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Figure 1 Anatomy of the craniocervical junction (reproduced with permission from Ref. [13]).
Figure 2
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Figure 2 The Traynelis classification.
Figure 3
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Figure 3 Diagnostic methods for atlanto-occipital dislocation (see text for details). A: Powers’ ratio; B: X-line method; C: Basion-dens interval; D: Basion-axis interval; E: Occipital condyle-C1 interval.
Figure 4
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Figure 4 Nineteen years old woman with traumatic atlanto-occipital dislocation following high-speed motor vehicle accident. A and B: CT of the cervical spine demonstrates no significant abnormalities in the midsagittal plane (A), but clear asymmetry of the occipito-atlantal joints in the coronal plane (B). The left occipital condyle-C1 interval is increased, measuring 6 mm; C: MRI of the cervical spine (T2WI) reveals abnormal signal suggesting disruption of the cruciate ligament; D: Post-operative cervical radiographs show O-C2 fusion using bicortical occipital screws and C2 pedicle screws; E: Post-operative CT of the cervical spine demonstrates reduction of the left occipital condyle-C1 interval to 4 mm. CT: Computed tomography; MRI: Magnetic resonance imaging.