All four of these STEPs were tested with the patient supine upon the upturned palm of the examiner's right hand. The spine of the sacrum rested in the space between the examiner's third and fourth fingers. The sacral apex and coccyx rested in the examiner's upturned palm. The tips of the examiner's third and fourth fingers were just lateral to the spinous processes of the fourth or fifth lumbar vertebra (depending on the patient's size). The distal aspects of the examiner's index and fifth fingers were in contact with the superior lateral aspects of the sacrum.

The test for restriction toward sacral flexion was performed by using the examiner's palm to gently induce an anterior motion of the sacral apex.

The test for restriction toward sacral extension was performed by inducing an anterior motion of the sacral base. Both of these motions were tested through several cycles of the CRI and the restrictions to examiner-induced motion toward both flexion and