ABSTRACT Background: The sacroiliac joints (SIJs), the largest axial joints in the body, sit in
between the sacrum and pelvic bones on either side. They connect the spine to the pelvis
and thus facilitate load transfer from the lumbar spine to the lower extremities. The majority
of low back pain (LBP) is perceived to originate from the lumbar spine; however, another
likely source of LBP that is mostly overlooked is the SIJ. This study (Parts I and II) aims to
evaluate the clinical and biomechanical literature to understand the anatomy, biomechanics …