Quadratus Lumborum Myofascial Pain Syndrome

Disclaimer: Please read the Disclaimer at the bottom of this page.
Copyright © Educom Pty Ltd: All material on this website (including the text, graphics, videos and downloadable files) is owned by or licensed to Educom Pty Ltd and is subject to copyright and other intellectual property rights under international conventions.

Quadratus Lumborum Myofascial Pain Syndrome

This section reviews the core concepts underlying this condition, providing a foundational understanding before progressing to diagnostic reasoning and clinical management. It covers the essential background areas of clinical anatomy, epidemiology, and pathophysiology, helping you build a clear picture of how and why this condition develops and presents in practice.

Introduction

Quadratus Lumborum Myofascial Pain Syndrome (QL MPS) is a common yet frequently underdiagnosed cause of lower back pain, resulting from myofascial trigger points in the quadratus lumborum (QL) muscle. This deep muscle plays a critical role in spinal stability, upright posture, lateral flexion, and pelvic control. Dysfunction of the QL can lead to referred pain in the lower back, pelvis, lateral hip, and gluteal region, often mimicking conditions such as lumbar radiculopathy or sacroiliac joint dysfunction. QL MPS typically presents as a dull, aching discomfort worsened by prolonged sitting, standing, or asymmetrical movement patterns. Because it stems primarily from muscular dysfunction rather than structural pathology, it is often mismanaged. Early recognition and targeted treatment can significantly reduce pain and restore function.

Clinical Anatomy

The quadratus lumborum is a deep muscle of the posterior abdominal wall, originating from the iliac crest and inserting onto the 12th rib and transverse processes of L1–L4. It is innervated by the ventral rami of T12–L4 spinal nerves. As both a spinal stabilizer and lateral flexor, it is prone to overuse, especially in the presence of poor posture, repetitive loading, or muscular imbalance. Trigger points in the QL can cause local and referred pain patterns that overlap with other lumbar and pelvic pathologies, contributing to diagnostic confusion.

Myofascial Trigger Points – A myofascial trigger point is a contraction knot found within a band of a muscle or in the muscle’s fascia. This contraction knot is considered to be responsible for nodularity, which can be detected by palpation. Previous publications have suggested that trigger points are found in specific locations within a muscle. However, more recent publications suggest that they can be found anywhere within a muscle. Therefore, the entire muscle should be thoroughly examined in order to locate them.

Epidemiology

QL MPS is seen across various populations. It is common in individuals with repetitive lifting, bending, or twisting activities, such as manual laborers and athletes involved in sports requiring spinal stabilization (e.g., weightlifting, rowing, golf). Sedentary individuals, particularly those with poor lumbar support during prolonged sitting, are also at risk. Contributing factors include leg length discrepancies, scoliosis, and altered gait mechanics, which create asymmetric loading on the lumbar spine and pelvis. Misdiagnosis is frequent, with QL MPS often mistaken for discogenic pain or facet joint pathology.

Pathophysiology

QL MPS develops through the formation of myofascial trigger points due to acute strain, repetitive microtrauma, or chronic postural stress. These stressors lead to local ischemia, metabolic disturbances, and sensitization of nociceptors, resulting in taut muscle bands and dysfunctional contractile activity. This not only causes pain but also restricts normal motion and muscle coordination. Secondary compensatory patterns may develop in adjacent muscles, such as the gluteals, hip flexors, and deep spinal stabilizers, perpetuating muscular imbalance. In chronic cases, persistent QL tension may contribute to joint dysfunction in the lumbar spine or sacroiliac region, intensifying symptoms. A 2019 international consensus concluded that moderate to excellent reliability for the presence of myofascial trigger points is based on the combination of a taut band, tender spot, local twitch response, and referred pain. The consensus was that at least two of these criteria are required for a myofascial trigger point diagnosis.

Taut Band and Tender Spot – Myofascial trigger points typically involve an exquisitely tender spot found within a taut band of the muscle or in the muscle’s fascia.

Local Twitch Response – A local twitch response is defined as a quick visible or palpable contraction of the muscle fibers when pressure is applied to a taut band of a trigger point.

Active and Latent Trigger Points – Myofascial trigger points can be classified as active or latent. Active trigger points generate pain spontaneously, even at rest or without touch, and reproduce the patient’s familiar pain when pressed.

Latent trigger points do not produce spontaneous pain but can elicit tenderness or referred pain only when compressed.

Referred Pain – A key feature of an active trigger point is the presence of referred pain, which is a manifestation of central sensitization. This central sensitization results in a spread of perceived pain to distant and larger areas of the body than just the local tenderness found at the taut band. Research suggests that the combination of acidic pH and pro-inflammatory mediators at the active trigger point contributes to the segmental spread of nociceptive input into the dorsal horn of the spinal cord. The dorsal horn neuron, in turn, sensitizes the central nervous system by transmitting nociceptive impulses superiorly to activate the somatosensory cortex, where pain information is perceived and interpreted. This is believed to cause hyperalgesia and referred pain.

Risk Factors

Many different activities and medical conditions may place individuals at greater risk for developing myofascial pain syndrome. These include:

• Joint hypermobility or ligamentous laxity (i.e., when ligaments are unable to provide sufficient joint stability, surrounding muscles must remain in constant contraction to compensate, which can lead to the development of myofascial trigger points)
• Musculoskeletal injuries
• Unaccustomed or intense exercise
• Muscle overload or repetitive physical activity
• Prolonged incorrect posture (e.g., poor ergonomics or habitual postures)
• Cold drafts or an intense cooling of muscles (e.g., sleeping in front of an air conditioner or under a ceiling fan)
• Lack of sleep or poor sleep
• Leg length inequality or other biomechanical disturbances
• Psychological stress, anxiety, and depression
• Fatigue

History

• One-sided lower back pain, often described as deep and aching.
• Referred pain to the buttock, iliac crest, or lateral hip; may also radiate to the groin, abdomen, or sacroiliac region.
• Increased pain with activities such as climbing stairs, rolling over in bed, or rising from a chair.
• Pain is episodic, with flare-ups during physical or postural strain.
• No neurological symptoms (e.g., numbness, tingling, or weakness).
• History of overuse, poor posture, repetitive movements, sudden lifting, or trauma.​

Physical Examination

• Marked tenderness on palpation over the quadratus lumborum, especially:
  – Along the iliac crest attachment
  – Lateral to the lumbar spine
• Palpable trigger points that reproduce the patient’s characteristic pain pattern.
• Restricted range of motion in the lumbar spine, most notably during forward bending, turning, or leaning to the opposite side of the affected muscle.
• Possible pelvic asymmetry, with an elevated iliac crest on the affected side.
• Neurological examination is normal, helping differentiate from disc or nerve-related conditions.

Imaging is not typically required to diagnose QL MPS, as it is primarily a clinical diagnosis based on history and physical examination. However, imaging may be necessary to rule out other causes of lower back pain, particularly in cases where red flags such as unexplained weight loss, fever, or progressive neurological symptoms are present.

• X-rays may be used to assess spinal alignment and rule out fractures or degenerative changes.
• MRI can help exclude lumbar disc pathology, facet joint arthritis, or sacroiliac joint dysfunction in cases where the diagnosis is uncertain.
• Musculoskeletal ultrasound may provide additional insight into muscle texture and fascial thickening in chronic cases of QL dysfunction.

Chilled Muscles and Myofascial Pain Syndrome

• Prolonged exposure of muscles to cold drafts (e.g., sleeping in front of an air conditioner, under a ceiling fan, or leaving hair wet after a shower) is a recognized risk factor for developing myofascial pain syndrome. Patients are often unaware that muscle chilling can contribute to the onset of their pain. As a result, practitioners must inquire about any recent exposure to cold drafts when evaluating patients with myofascial pain. Identifying this potential trigger can aid in diagnosing and preventing symptom recurrence.

Ultrasound Therapy for Myofascial Pain Syndrome

• Based on our clinical experience, many patients with myofascial trigger points respond well to treatment with ultrasound therapy, including ultrasound phonophoresis, applied directly to the trigger points. This therapy aims to disperse the accumulation of congestion, such as lactic acid and other inflammatory chemicals, which are often associated with trigger points.
• Compared to myofascial release techniques (described below), ultrasound offers several advantages: it is painless for the patient, can target trigger points at deeper tissue levels, and may accelerate recovery.

Myofascial Release Technique

When performing the myofascial release technique, follow these steps:

• Step 1: Start by applying gentle pressure to the trigger point and gradually increase it until the patient experiences mild local pain (you will feel an increase in tissue resistance). Hold this pressure steady without increasing it further until the patient reports that the pain has subsided (you will also notice a reduction in tissue resistance).
• Step 2: Once the initial pain has subsided, gradually apply deeper pressure to the trigger point until the patient again reports local pain (you will once again feel an increase in tissue resistance). Maintain this pressure until the patient indicates that the pain has eased.
• Step 3: After the second easing of pain, apply an even deeper pressure to the trigger point until local pain returns (you will feel an increase in tissue resistance). Continue to hold this pressure until the patient reports that the pain has once again subsided.

Differential Diagnosis: Key Considerations

Several conditions can mimic pain caused by Quadratus Lumborum Myofascial Pain Syndrome, making accurate differentiation essential for proper diagnosis and effective management:

Musculoskeletal Conditions

• Lumbar facet joint syndrome
• Lumbar disc herniation
• Iliolumbar ligament strain
• Sacroiliac joint dysfunction
• Hip joint pathology (e.g., labral tear, hip osteoarthritis)
• Piriformis syndrome
• Thoracolumbar junction syndrome
• Erector spinae or multifidus strain

Neurological Causes

• Lumbar radiculopathy
• Cauda equina syndrome (red flag — must be ruled out)
• Spinal stenosis
• Peripheral nerve entrapment (e.g., lateral femoral cutaneous nerve – meralgia paresthetica)

Visceral Referred Pain

• Renal conditions (e.g., kidney stones, pyelonephritis)
• Pancreatitis
• Pelvic organ pathology (e.g., ovarian cysts, endometriosis)
• Abdominal aortic aneurysm (AAA) (especially in older adults with vascular risk)

Systemic/Other

• Fibromyalgia
• Inflammatory spondyloarthropathies (e.g., ankylosing spondylitis)
• Metastatic bone disease or spinal tumors
• Infectious spondylodiscitis

Red Flags for Low Back Pain

Trauma or Structural Risk

• Recent significant trauma (e.g. fall, accident)
• Minor trauma in elderly or osteoporotic patients
• History of osteoporosis or long-term corticosteroid use

Infection Risk

• Fever, chills, or unexplained weight loss
• History of IV drug use or immunosuppression
• Recent infection (e.g. UTI, skin infection)

Malignancy

• History of cancer
• Unexplained weight loss
• Pain is worse at night or is unrelieved by rest
• Age >50 or <20 with new onset of back pain

Neurological Compromise

• Progressive neurological deficits (e.g., weakness, numbness or tingling, or foot drop)
• Saddle anesthesia
• Loss of bowel or bladder control (urinary retention or incontinence)
• Symptoms of cauda equina syndrome

Inflammatory/Autoimmune

• Morning stiffness >30 minutes
• Pain improves with activity, not rest
• Personal or family history of inflammatory arthritis (e.g., ankylosing spondylitis, IBD)

Vascular

• Risk factors for abdominal aortic aneurysm (AAA):
• Age >65, male, smoking history, hypertension
• Pulsatile abdominal mass
• Sudden, severe abdominal or back pain

Disclaimer: The following suggestions for conservative therapy and home care are provided for educational purposes only and are based on published literature and the clinical experience of the course authors. They are intended as general guidance and should not be interpreted as a prescriptive or definitive approach for any individual patient or condition. Clinical decisions should always be based on practitioner judgment, individual patient presentation, current evidence, and applicable professional standards within the practitioner’s jurisdiction. If symptoms persist, worsen, or new concerns arise, appropriate medical evaluation or referral is recommended. Use of this material is subject to the Disclaimer located at the bottom of this webpage.

Pain Relief and Inflammation Management

• Heat packs
• Ultrasound therapy
• Acupuncture/Dry needling

Myofascial release

• Gentle spinal mobilization/manipulation to improve regional mobility (if indicated).

Education and Self-Management Advise the patient to:

• Maintain good posture during daily and work activities.
• Limit prolonged sitting and flexed postures, and avoid repetitive lifting.
• Apply heat to the lower back area to help relax the quadratus lumborum muscles.
• Avoid direct exposure to cold air or drafts, as this can aggravate muscle tightness and trigger point sensitivity.
• Perform your prescribed exercises consistently. If any movement increases your symptoms, stop the exercise, apply ice to the area, and inform your healthcare provider so your program can be adjusted.

Therapeutic Exercises

• Spine Mobility Exercises
• Core Strength Exercises