Evidence of Upper Cervical Asymmetry by means of Neutral-Zero Method

Immediately after reposition of the left digastricus in front of the atlas, an average increase of head mobility of ten precent has been measured. 

Lateral rotation increases by 14 percent, flexion/extension increases by 10 percent and lateral flexion by 7 percent on average respectivly (see table). 

In grave cases of upper cervical asymmetry, the increase of head mobilty can sometimes amount up to 30 percent. 

In addition, perfectly symmetric head rotations can be noticed, because the paired muscles of the upper cervicals make possible symmetric rotation values whenever the onesided digastricus pressure disappears.