What is the pathophysiology of sacroiliac pain in low back pain (LBP)?

Updated: Aug 22, 2018
  • Author: Jasvinder Chawla, MD, MBA; Chief Editor: Stephen A Berman, MD, PhD, MBA  more...
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The sacroiliac joint is a diarthrodial synovial joint that receives its primary innervation from the dorsal rami of the first 4 sacral nerves. Arthrography or injection of irritant solutions into the sacroiliac joint provokes pain with variable local and referred pain patterns into regions of the buttock, lower lumbar area, lower extremity, and groin. As determined by using a variety of blocking techniques, the reported prevalences of sacroiliac pain have been widely variable (2-30%) in patients evaluated for chronic LBP.

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