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Fig. 1 | BMC Musculoskeletal Disorders

Fig. 1

From: Relationship between facet tropism and facet joint degeneration in the sub-axial cervical spine

Fig. 1

Illustration of the determination of the facet orientations in reconstructed cervical spine. The facet plane bisects the facet joint space; the transverse plane parallel to the superior endplate of the vertebral body and perpendicular to the sagittal plane; the sagittal plane bisects the vertebral body; the coronal plane are perpendicular to both the transverse plane and the sagittal plane (a). The normal vectors of one facet plane (n1) and transverse plane (n2), of which the coordinates were used for the calculation of the angle between the facet plane and transverse plane (b)

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