Atlas Orthogonal Chiropractic:
A system of adjusting subluxations of the cervical spine by means of its uppermost vertebra (C1-aka “atlas”). The actual adjustment is performed with an Atlas Orthogonal Percussion Adjusting Instrument. The “AO” instrument works by percussion -a sound wave- and the bone is gently restored to its normal position.
Links
Atlas Orthogonal Percussion Instrument
A great link for Atlas information: Atlas Axis Vertebrae Info
Gabe-AO adjustment
Atlas Orthogonal Percussion Instrument