EXTENSION-ROTATION TEST FOR CERVICAL ARTERY DISEASE The vertebral artery supplies blood flow to the hindbrain and courses through the transverse foramina of the cervical levels from C6 to C1 and is tethered at foramina C2, C1 and the atlanto-occipital membrane. Abnomal stress (amongst others through cervical rotation) on this artery may lead to a reduction of blood flow to the hindbrain, which we call vertebrobasilar insufficiency or VBI– a condition that can develop into cerebral or brain stem

INTERVERTEBRAL MOTION ASSESSMENT OF THE UPPER CERVICAL SPINE IN SIT If your flexion-rotation test was positive, you'd know that there is decreased mobility in rotation at segment C1-C2. However, C1-C2 can be affected by hypomobility at C2-C2 and/or C0-C1. For this reason, you'd want to assess all of these segments seperately in order to be able to determine the hypomobile segment. In the following video we're showing you how to assess the upper cervical spine (C0-C3) in sitting position. When it