Accessory sacroiliac joint

Dr Henry Knipe et al.

Accessory sacroiliac joints are a common finding, present on ~15% (range 13-17.5%) of CT studies, and may be unilateral or bilateral. They are an articulation between the medial aspect of the posterior superior iliac spine and the sacrum just lateral to the second dorsal sacral foramen. They may be congenital (diarthrodial joint) or more commonly acquired (fibrocartilaginous joint) in origin. 

Anatomy: Spine

Article information

rID: 58401
Section: Anatomy
Synonyms or Alternate Spellings:
  • Accessory sacroiliac joints (ASIJ)
  • Accessory sacro-iliac joints

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Cases and figures

  • Case 1
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