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Semin Musculoskelet Radiol 2023; 27(02): 221-225
DOI: 10.1055/s-0043-1761954
Review Article

Anatomical Variants of the Sacroiliac Joint

Sammy Badr 
1   Department of Musculoskeletal Imaging, University of Lille, CHU Lille, Lille, France
2   CHU Lille, University Lille, Lille, France
,
Huda Khizindar
1   Department of Musculoskeletal Imaging, University of Lille, CHU Lille, Lille, France
,
Youssef Boulil
1   Department of Musculoskeletal Imaging, University of Lille, CHU Lille, Lille, France
,
Ralph Abou Diwan
1   Department of Musculoskeletal Imaging, University of Lille, CHU Lille, Lille, France
,
Xavier Demondion
1   Department of Musculoskeletal Imaging, University of Lille, CHU Lille, Lille, France
,
Anne Cotten 
1   Department of Musculoskeletal Imaging, University of Lille, CHU Lille, Lille, France
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Abstract

Anatomical variants are frequently encountered when assessing the sacroiliac joints (SIJ) using magnetic resonance imaging. When not located in the weight-bearing part of the SIJ, variants associated with structural and edematous changes can be misinterpreted as sacroiliitis. Their correct identification is necessary to avoid radiologic pitfalls. This article reviews five SIJ variants involved in the dorsal ligamentous space (accessory SIJ, iliosacral complex, semicircular defect, bipartite iliac bony plate, and crescent iliac bony plate) and three SIJ variants involved in the cartilaginous part of the SIJ (posterior dysmorphic SIJ, isolated synostosis, and unfused ossification centers).

Keywords

anatomy - magnetic resonance imaging - sacroiliac joint - spondylarthritis - variant


Publication History

Article published online:
03 April 2023

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