Quadratus Lumborum (“QL”)

Joe Muscolino

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The quadratus lumborum on the right side of the body. The erector spinae paraspinal musculature has been ghosted in on the left side.

  • The quadratus lumborum attaches from the inferomedial border of the 12th rib and the transverse processes of L1-L4 to the posteromedial iliac crest.



  • The quadratus lumborum elevates the same-side pelvis and anteriorly tilts the pelvis at the lumbosacral joint.
  • It extends and laterally flexes the trunk at the spinal joints.
  • It also depresses the 12th rib at the costovertebral joint.