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Pain in the Sacroiliac SI joint can extend into the lower back, buttocks, groin, and leg, and may result from wear and tear or injury, particularly when the ligaments supporting the joint are stretched. This SI joint is instrumental in the transfer of weight between your upper body and legs. It also acts as a shock-absorber during motion. Damage to the SI joint is common and may be caused by too little movement (called hypomobility) or too much movement (hypermobility).