Quadratus Lumborum

Quadratus Lumborum Muscle

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

Origin : Posterior iliac crest.
Iliolumbar ligament.

Insertion : Twelfth rib.
Transerve processes of L1-L4.

Actions : Lateral flexion (side-bends) of the trunk.

Innervation : Ventral rami of the subcostal nerve.
Lumbar nerves.

Daily uses : Bending sideways to pick something up.

Example strengthening exercises : Side bends.

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