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Figure 9: (a and b) Atlanto-axial facet joint angle subtended between the line passing tangentially between superior surface of facet joint (x-axis) and that passing from midline through the tip of odontoid process (y-axis). The angle is measured bilaterally. Increase in angle (>130°) on one side is related with a more vertical facet joint and is often associated with an increase in rotational deformity at the craniovertebral junction (type 5b)

Figure 9: (a and b) Atlanto-axial facet joint angle subtended between the line passing tangentially between superior surface of facet joint (x-axis) and that passing from midline through the tip of odontoid process (y-axis). The angle is measured bilaterally. Increase in angle (>130°) on one side is related with a more vertical facet joint and is often associated with an increase in rotational deformity at the craniovertebral junction (type 5b)