A small bursa at the iliac insertion of the quadratus lumborum, where the muscle attaches to the posterior iliac crest. It reduces friction as the QL contracts during lateral trunk flexion and forced expiration.
QL iliac insertion bursitis contributes to posterior iliac crest and lower lumbar pain in manual workers, firefighters, and athletes who perform repetitive lateral trunk loading. It is adjacent to the iliolumbar ligament and QL origin bursa already documented. Ultrasound-guided injection at the QL iliac insertion targets this specific bursa.
Bursal inflammation at the quadratus lumborum iliac crest insertion producing lateral lower lumbar pain with trunk lateral flexion, managed with targeted injection and core stabilisation.
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