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“Hip” is socket (acetabulum) where femur (upper leg bone) inserts into pelvis (ilium/ischium). If hip were to dislocate, person would have excruciating pain & be unable to stand/walk. Sacroiliac joint (SIJ) is 17 cm square in area; vs. ilium & sacrum/coccyx (tail bone)....
SIJ commonly subluxes in pwHSD, generating painful ligament stretch interpreted as low back/hip pain in 13-30% pwLow Back Pain. When SIJ subluxes, Ilium rotates CW or CCW around a virtual transverse axis from Right to Left & through both mid-SIJs ....
Rotation of Ilium relative to Sacrum creates an oblique relationship of contours of the two bones. In a lean person, & depending on whether there is a CW or CCW rotation, the tail bone can appear to become stationed closer to the hip region on that side....
