What is the role of innervation in sacroiliac joint (SIJ) injuries?

Updated: Jan 16, 2019
  • Author: Andrew L Sherman, MD, MS; Chief Editor: Sherwin SW Ho, MD  more...
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The nerve supply of the SIJ originates from multiple lumbosacral root levels with partial innervation from L2 (anterior joint) to S3 (posterior joint). Because the root innervation can vary so widely, the pain referral patterns from primary sacroiliac pain can also vary. Fortin et al interviewed multiple patients documented to have sacroiliac pain by anesthetizing the joint with lidocaine injections under fluoroscopic guidance. [8, 9] He found referral patterns ranging from localized buttocks pain to frank radicular leg pain and many other descriptions in between.

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