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Quadratus Lumborum

The quadratus lumborum or QL is a common cause of back pain which is to one side and comes on after lifting or twisting.


  • Posterior iliac crest.
  • Iliolumbar ligament.


  • Twelfth rib.
  • Transerve processes of L1-L4.


  • Lateral flexion (side-bends) of the trunk.


  • Ventral rami of the subcostal nerve.
  • Lumbar nerves.

Daily uses

  • Bending sideways to pick something up.

Example strengthening exercises

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