Prior to the mid-1930s, the vast majority of medical literature concerning low back pain was dedicated to descriptions of the sacroiliac articulation (1,2). More recent studies further show the joint to be a significant contributor to low back pain (3). Diseases or disease states that frequently involve the joint include degenerative, infectious, inflammatory (i.e., ankylo-sing spondylitis, psoriatic arthritis, Reiter's syndrome, and enteropathic), traumatic, neoplastic, iatrogenic, metabolic, sacroiliac joint syndrome, and referred pain, with the most common source of low back pain emanating from the sacroiliac joint being sacroiliac dysfunction (4). Spinal surgery, specifically lumbar fusion, can induce dysfunctional mechanical changes that lead to sacroiliac joint syndrome and pain (5). Sacroiliac dysfunction is caused by an acquired degeneration and mechanical instability leading to a fixed subluxation or a hypermobility of the joint (3-6).
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