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