ISASS Policy Statement – Minimally Invasive Sacroiliac Joint Fusion Morgan P. Lorio, MD, FACS Neuro-Spine Solutions, Bristol, TN Ralph Rashbaum, MD Texas Back Institute, Plano, TX This paper was originally published here. A PDF version of the Policy Statement is available here. Background The sacroiliac (SI) joints are paired diarthrodial articulations of the sacrum and ilium and serve as the connection between the spine and pelvis. The small amount of motion in the joint (2-4 degrees) occurs primarily through nutation and counternutation of the sacrum.¹ There are no muscles that cross solely the SI joint, thus there are no prime movers. Instead, movement is dependent on the articulations and movement within the lumbopelvic hip complex (e.g. flexion at the hip results in
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