Trigger points in the Quadratus Lumborum muscle.

The quadratus lumborum muscle is a commonly overlooked source of low back pain and is often responsible for “pseudo disc syndrome”. This muscle originates on the inferior border of the 12th rib and lumbar transverse processes. It inserts on the iliac crest and iliolumbar ligament. The q.l.’s main actions are extension and lateral flexion of the spine. It also acts as a stabilizer of the lumbar spine. Trigger points in this muscle refer pain into the sacroiliac joint and the lower buttock. Pain can also spread anteriorly along the crest of the ilium into the lower abdomen and groin and to the greater trochanter.

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