Abstract: The machine of the present invention measures and records in terms of the orientation planes of motion the presence of, the location, of and the severity of the postural distortion-stress effects of C-1 subluxations on the human body, making possible thereby statistical analyses between C-1 misalignments (determined by X-ray analysis) and such postural distortion-stress effects on the skeletal framework as directly result from the misalignment interferences of C-1 on the nervous system and its normal functioning. This machine can demonstrate the postural distortion-stress effects of C-1 subluxation on the spine by checking the malpositional relationships of upper thoracic vertebral segments and pelvis prior to and subsequent to C-1 correction, indicating thereby the corrections obtainable throughout the spine and thus reducing the need for repeated applications of X-radiation to the patient.