The sacroiliac joint is a diarthrodial synovial joint in the pelvis. Anatomically, it is described as a symphysis, its synovial joint characteristics being limited to the distal cartilaginous portion on the iliac side. It is a continuous ligamentous stocking comprising interconnecting ligamentous structures and surrounding fascia. Its ligaments, the primary source of its stability, include the anterior, interosseous and dorsal sacroiliac, the iliolumbar, sacrotuberous, and sacrospinous. Structural reinforcement is also provided by neighboring fascia and muscles. Lower back pain is a common presentation of sacroiliac joint disease, the best-established treatments being corticosteroid injections, bipolar radiofrequency ablation, and sacroiliac joint fusion.

骶髂关节是骨盆中的一个关节滑膜关节。在解剖学上，它被描述为一个联合，其滑膜关节特征仅限于髂侧远端软骨部分。它是一种连续的韧带袜，包括相互连接的韧带结构和周围的筋膜。它的韧带是其稳定性的主要来源，包括骶髂前、骨间和背侧、髂腰、骶结节和骶棘。相邻的筋膜和肌肉也提供了结构加固。下背痛是骶髂关节疾病的常见表现，最成熟的治疗方法是皮质类固醇注射、双极射频消融和骶髂关节融合术。