The anatomy of the sacroiliac joint (SIJ) is complex with wide variations inter-individually as well as intra-individually (right versus left) and a frequent occurrence of anatomical variants. Besides, the joints are subject to strain, which may elicit non-inflammatory subchondral changes such as bone marrow edema (BME), sclerosis, and fat deposition simulating inflammatory SIJ changes. Furthermore, normal physiological changes during skeletal maturation can make interpretation of SIJ magnetic resonance imaging in children challenging. Knowledge about the wide range of normal findings is therefore important to avoid misinterpretation of findings as pathological. This review describes the current knowledge about normal SIJ findings across all ages.

中文翻译：

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不同年龄段的骶髂关节——什么是正常的？


骶髂关节 (SIJ) 的解剖结构很复杂，个体间和个体内部（右与左）差异很大，并且经常出现解剖变异。此外，关节承受压力，可能会引起非炎症性软骨下变化，例如骨髓水肿（BME）、硬化和模拟炎症性 SIJ 变化的脂肪沉积。此外，骨骼成熟过程中的正常生理变化可能会给儿童 SIJ 磁共振成像的解释带来挑战。因此，了解各种正常结果对于避免将结果误解为病理结果非常重要。这篇综述描述了目前对各年龄段正常 SIJ 结果的了解。