The Absolute+Axis® (AA) goniometer establishes a "true" vertical or horizontal to the start point of a measurement
Many goniometric measurements require one arm of the goniometer to be positioned either horizontally or vertically
The other arm is then lined-up with the patient's body part
Until now, the practitioner had to "assume" or "eyeball" the vertical or horizontal position
This interpolation is often incorrect and introduces measurement error
The Absolute+Axis® goniometer removes measurement variability and allows the practitioner to concentrate on correct placement of the other goniometer arm and the patient's body position
Some measurements the AA goniometer is designed to improve are shoulder and hip rotation (internal, external); cervical flexion, extension, rotation and side bending; hamstring flexibility; and active ROM
