Patient is supine on the table with the operator sitting at the head of the table.

Operator’s hands grasp the sides of the patient’s head with the lateral aspect of the index fingers monitoring along the posterior arch of the atlas and the rest of each hand controlling the head.

Operator introduces backward bending to the first barrier by rolling the head posterior around an axis of rotation through the external auditory meatus.

Using the hands, the operator introduces translation of the head from right to left, maintaining the eyes parallel to the head of the table sensing for resistance to movement at his index fingers. If resistance is felt, motion restriction is to backward bending, right side-bending, and left rotation (C0 flexed [F], side-bent left [S_left], and rotated [R_right].  Something interfered with the right condyle gliding forward.

Using the hands, the operator introduces translation of the head from left to right sensing for resistance to movement at his index fingers.  If resistance is encountered, the restriction is to backward bending, left side-bending, and right rotation (FS_rightR_left).  Something interfered with the left condyle gliding forward.