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Musculus Quadratus Lumborum – Anatomy and Function

The musculus quadratus lumborum is a deep back muscle of the lumbar region. It stabilizes the spine and pelvis and plays a key role in trunk movements and posture.

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The musculus quadratus lumborum is a deep back muscle of the lumbar region. It stabilizes the spine and pelvis and plays a key role in trunk movements and posture.

What is the Musculus Quadratus Lumborum?

The musculus quadratus lumborum (also referred to as M. quadratus lumborum or the QL muscle) is a paired, quadrilateral skeletal muscle located on both sides of the posterior abdominal wall. It is classified as a deep trunk muscle and is anatomically associated with the lumbar spine. This muscle plays a critical role in stabilizing the spine, pelvis, and trunk, and is involved in a wide range of everyday movements.

Anatomy and Location

The musculus quadratus lumborum extends between the iliac crest and the 12th rib, with additional attachments to the transverse processes of lumbar vertebrae L1 through L4. It is situated deep within the posterior abdominal cavity, posterior to the peritoneum and adjacent to the lumbar spine. Together with other deep back and abdominal muscles, it forms a muscular corset around the spine.

Neighboring Structures

Medially: lumbar spine and musculus psoas major
Laterally: transversus abdominis muscle
Posteriorly: thoracolumbar fascia
Anteriorly: kidneys and ureter

Function

The musculus quadratus lumborum fulfills several important functions:

Lateral flexion of the spine: Unilateral contraction causes the trunk to bend toward the same side.
Pelvic stabilization: It fixes the pelvis during walking and standing, especially when one leg is lifted.
Accessory respiratory muscle: It anchors the 12th rib, supporting the respiratory muscles, particularly the diaphragm.
Spinal extension: Bilateral activation can contribute to extension of the lumbar spine.
Postural stabilization: It plays a key role in maintaining upright posture.

Innervation and Blood Supply

The musculus quadratus lumborum is innervated by branches of the lumbar plexus, particularly the subcostal nerve (T12) and the ventral rami of spinal nerves L1 to L3. Arterial blood supply is primarily provided by the lumbar arteries and branches of the iliolumbar artery.

Clinical Relevance

The musculus quadratus lumborum is of significant clinical importance, as it is frequently involved in the development of lower back pain. Muscle tension, trigger points, and overuse of this muscle are among the most common causes of deep lumbar pain (lumbago).

Common Clinical Conditions

Myofascial pain: Trigger points in the QL muscle can radiate pain to the hip, buttock, and groin.
Lumbago (acute low back pain): Acute spasm or blockage of the muscle leads to sudden, intense pain in the lower back.
Pelvic tilt: Chronic shortening of one of the two muscles can lead to pelvic and spinal imbalance.
Sciatica-like symptoms: Due to its proximity to nerve roots, irritation of the QL muscle can produce symptoms resembling sciatic nerve pain.

Diagnosis

Clinical assessment of the musculus quadratus lumborum includes:

Palpation of the muscle for tension and trigger points
Functional tests of lateral trunk flexion and core stability
Imaging studies such as MRI (magnetic resonance imaging) when structural damage is suspected
Neurological examination to rule out nerve involvement

Treatment and Therapy

Treatment of complaints related to the musculus quadratus lumborum depends on the underlying cause and severity:

Conservative Treatment

Physiotherapy: Targeted stretching and strengthening exercises to restore muscular balance
Manual therapy: Treatment of trigger points and muscle tension by trained therapists
Heat therapy: Application of heat to relax tense muscles
Medication: Short-term use of muscle relaxants or nonsteroidal anti-inflammatory drugs (NSAIDs) for acute pain

Invasive Procedures

Trigger point injections: Local injections with anesthetics or corticosteroids for persistent trigger points
Dry needling: Targeted needle treatment to release trigger points

Prevention

Regular core muscle strengthening (core training)
Ergonomic workplace design
Avoiding asymmetric loading and compensatory postures

References

Standring S. (Ed.) (2020): Gray's Anatomy - The Anatomical Basis of Clinical Practice. 42nd edition. Elsevier, Philadelphia.
Moore K.L., Dalley A.F., Agur A.M.R. (2018): Clinically Oriented Anatomy. 8th edition. Wolters Kluwer, Philadelphia.
Travell J.G., Simons D.G. (1992): Myofascial Pain and Dysfunction - The Trigger Point Manual. Volume 2. Williams and Wilkins, Baltimore.

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