MR anatomical variation of sacroiliac joints

doi:10.3969/j.issn.2095-4344.1472

Abstract

Abstract:

BACKGROUND: In previous studies, only X-ray or CT imaging was used to describe the anatomical variations of the sacroiliac joint, but MRI has not provided a unified and specific description.

OBJECTIVE: To describe the MRI characteristics of anatomical variations of sacroiliac joints and observe the potentially misleading MR imaging characteristics.

METHODS: The MRI findings of the First Affiliated Hospital, University of South China in the past two years were retrospectively analyzed. One of the objectives was to describe potentially misleading edema or structural changes associated with anatomical variations in sacroiliac joints. Patients meeting the Assessment in Ankylosing Spondylitis International Society criteria were excluded in this study to ensure that signal intensity changes were not associated with sacroiliac arthritis.

RESULTS AND CONCLUSION: (1) 158 patients were finally included in the study, among which 40 patients showed unilateral or bilateral anatomical variation in sacroiliac joints. Iliosacral complex and sacral defect were found in 17 cases and 22 cases respectively, solitary hyperosteogeny in 1 case, and sacroiliac joint deformity in 23 cases. There are two kinds of anatomical variations of sacroiliac joints in the same patient. No cases of accessory sacroiliac joints and unhealed ossification center were found. (2) Abnormal changes in the structure and/or edema of the opposite bone were often observed in the sacroiliac joints. The appearance of sacroiliac complex and sacral defects may be related to the presence of blood vessels protruding along the surface of the bone. (3) The results showed that anatomical variations of sacroiliac joints were relatively common on MRI, especially in women. These variations may be accompanied by changes in signal strength that are not necessarily inflammatory in nature but may be congenital.

Key words: sacroiliac joint, anatomical variation, magnetic resonance imaging, bone marrow edema, signal intensity, iliosacral complex, sacral defect

CLC Number:

R459.9|R445.2|R318

Zhao Heng, Hu Rong, Liu Jincai, Luo Guanghua, Qing Weipeng, Peng Zhaojie. MR anatomical variation of sacroiliac joints[J]. Chinese Journal of Tissue Engineering Research, 2019, 23(28): 4516-4521.

Figures/Tables 4

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