This neuromuscular distortion affects the movement of the sacroiliac joints very specifically. Normal motion, when the spine bends forward, when it bends side to side, and when one leg is raised and then the other leg is raised, was established 50 years ago by Dr. Henri Gillet. Normal movement of the ilia is away from the lumbar spine on lateral flexion of the trunk. Any extension subluxation in any vertebra in the spine distorts movement in the sacroiliacs, by the ishium moving toward the sacrum when the knee is bent on that side. When the other knee is bent, the sacrum moves toward the ischium on that side.
Normal movement is for the ischium to move away from the sacrum when that knee is bent.
When the other knee is bent, the sacrum should move away from the ischium. Rotational subluxation in any vertebra in the spine distorts movement in the sacroiliacs, by moving the ilium toward the sacrum when the torso bends forward. The normal movement is for the ilium to move away from the sacrum on forward bend of the torso. It is true that degrees of flexion or extension can vary 180 degrees rotationally, and rotation subluxations can have degrees of flexion and extension, but the major direction of distortion will follow the distorted sacroiliac movement I have just outlined. Lack of specific breath motion is also an indicator of the presence of subluxation.