Low back pain (LBP) is the fifth most common complaint for all doctor visits (1). Studies have shown that LBP is often not confined to the spine and that sacroiliac (SI) joint is involved in 25% of the patients with complaints of back pain (2). The diagnosis of SI joint pain can be difficult because there is a significant overlap between LBP, radicular pain, and SI joint pain. Oftentimes, successful treatment of SI joint pain itself serves as a diagnostic tool (3). Some of the causes of SI joint pain include trauma, infection, metabolic causes, fracture, inflammatory processes, and arthritic processes (2,4). Conservative treatments for SI joint pain include the following: pain medications, nonsteroidal anti-inflammatory drugs, steroid injection (5), physical therapy (6), and exercise program. Surgical procedures include the following: radiofrequency ablation of the SI joint (7,8), lumbar and sacral radiofrequency neurotomy (9,10), and fusion (11,12). In a large study, the success for SI joint fusion has been found to be between 60% and 75% (7).
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