The sacroiliac joint (SIJ) is anatomically and biomechanically unique and serves as a principal weight-bearing joint. Characterized as both diarthrotic and amphiarthrotic, its articular surfaces interlock to comprise a self-bracing joint that provides stability for the axial skeleton. The SIJ is innervated by the lateral branches of S1, S2, and S3 and more infrequently by L5 and S4. Etiology of SIJ pain includes trauma, structural abnormalities, previous lumbosacral fusion surgery, postpartum mechanical changes, and inflammatory diseases. Furthermore, pain from lumbar and hip pathologies may be difficult to distinguish from SIJ pain. Recent treatment for SIJ pain has expanded from conservative management to include SIJ fusion for intractable pain.
KeywordsSacroiliac joint Low back pain Surgical fusion MIS Radiofrequency ablation Spine
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