The sacroiliac joint is homologous to scapulothoracic joint of upper extremity; both of them connect the axial skeleton to the appendicular skeleton. However the SIJ enjoys much lesser freedom than the scapulothoracic joint as it has a lot of constrains bestowed upon it. The pelvis has to protect the visceral organs (done by the rib cage in upper body), act as a stable base for the bony spine, provide anchorage of important muscles of lower limb and trunk and move in rhythm with the lower limb during locomotion. The availability of motion in the SIJ is thus minimal, but this meager amount of range of motion has a lot of significance.  Both the SI Joints, along with the pubic symphysis work in a close kinematic pattern to handle torsional stress and also as shock absorbers during weight transfer between the extremities in gait.

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