Non-Specific Low Back Pain
SpineOverview
Non-specific low back pain (NSLBP) is low back pain without a clearly identifiable structural pathology or nerve root compromise, accounting for approximately 85-90% of all low back pain presentations. It is characterized by pain in the lumbar region that may or may not radiate, with multifactorial causation including muscular, ligamentous, postural, and psychosocial factors. Management focuses on maintaining activity, addressing mechanical dysfunction, and optimizing biopsychosocial factors to prevent chronicity.
Pathophysiology
Non-specific low back pain typically results from a combination of mechanical dysfunction, muscular imbalance, and altered neuromuscular control rather than a single discrete lesion. Common mechanisms include lumbar facet joint irritation, ligamentous strain, muscular fatigue or spasm, discogenic pain without nerve involvement, sacroiliac joint dysfunction, and myofascial trigger points. The condition is perpetuated by decreased physical activity, fear-avoidance behaviors, poor postural habits, core instability, and psychological stress, which collectively reduce tissue resilience and increase pain sensitivity through central sensitization mechanisms. Repetitive microtrauma, cumulative postural strain, and inadequate recovery periods lead to chronic inflammation and maladaptive motor patterns.
Patient Education
Stay active within pain tolerance, maintain good posture and core engagement, and address stress and sleep quality, as these factors are critical to recovery and preventing long-term disability.
Typical Presentation
Site
Lower lumbar region (L4-S1), often bilateral or unilateral; may radiate to buttock or upper thigh without crossing the knee
Quality
Aching, stiffness, muscle tension, sometimes stabbing or sharp with movement; patients may describe 'catching' or 'locking' sensations
Intensity
Highly variable (2-8/10), often worse in morning or after prolonged postures, may fluctuate throughout the day
Aggravating
Prolonged sitting or standing, bending forward, lifting, twisting, poor posture, fatigue, emotional stress, inadequate sleep
Relieving
Positional changes, movement and activity, heat, massage, stretching, rest periods (though complete immobility is counterproductive)
Associated
Morning stiffness, muscle tightness in lower back and hip flexors, reduced spinal mobility, postural dysfunction, movement-related anxiety, sleep disturbance
Orthopaedic Tests
Straight Leg Raise (SLR) Test
Procedure
Patient supine, both legs straight, head on a pillow. Lift the symptomatic leg slowly with the knee held straight until the patient reports symptoms or you reach end of range. Note the angle and where the symptoms are felt. Adding ankle dorsiflexion or neck flexion at that point helps tell nerve pain from hamstring stretch.
Positive Finding
The patient's familiar leg pain, usually below the knee, reproduced as the leg is raised and made worse by ankle dorsiflexion or neck flexion. Back pain alone or a posterior thigh stretch does not count.
Interpretation
In non-specific low back pain this test is a screen, not a diagnosis. A negative test fits the picture of back pain without nerve-root involvement. A positive test points away from non-specific low back pain towards radicular pain, and the neurological examination should follow. Here the SLR is used to check for nerve-root involvement, which by definition is absent in non-specific low back pain. Its published accuracy is for disc herniation causing leg pain (see the lumbar disc herniation page), so no figure is shown here.
Lumbar Flexion Range of Motion (Schober Test or Modified-Modified Schober)
Procedure
Patient standing. Mark the midpoint between the two posterior superior iliac spines (the dimples of Venus), then mark 10 cm above it (modified-modified Schober). Ask the patient to bend forward as far as comfortable with knees straight and re-measure the distance between the marks.
Positive Finding
Less increase in the distance than expected, or bending limited by pain or guarding. Record the measurement and what stopped the movement.
Interpretation
A measure of how much the lumbar spine moves, not a diagnostic test. Use it as a baseline and to track change with treatment. Marked, persistent loss of lumbar flexion in a younger adult with inflammatory-type back pain (morning stiffness, better with movement) should prompt assessment for axial spondyloarthritis. This is a range-of-motion measurement, not a test that diagnoses a condition, so sensitivity and specificity do not apply.
Palpation for Segmental Dysfunction or Tenderness
Procedure
Patient prone with a pillow under the abdomen if needed. Palpate the spinous processes, the paraspinal muscles and the interspinous spaces from T12 to the sacrum, then apply gentle posterior-to-anterior pressure at each level. Ask whether any pressure reproduces the familiar pain.
Positive Finding
Tenderness, increased muscle tone or reproduction of the familiar pain at one or more levels, compared with levels above and below.
Interpretation
Helps locate the painful region and guides where to start treatment. Agreement between clinicians on which segment is stiff or tender is poor, so the finding should not be used to name a pain source. Tenderness in non-specific low back pain is common and expected.
Quadrant Test (Extension/Rotation)
Procedure
Patient standing. Guide the trunk into extension, then side-bending and rotation towards the painful side, and add gentle overpressure through the shoulders if tolerated. Repeat to the other side.
Positive Finding
Reproduction of the familiar local back pain on the side of the movement. Leg pain in this position is recorded separately, as it may reflect narrowing of the foramen rather than a joint source.
Interpretation
A movement that loads the posterior joints and structures on one side. A positive result tells you which movement provokes the pain, which is useful for treatment and for tracking progress. It cannot identify the facet joint as the pain source.
Prone Hip Extension Test (Prone Hip Extension or Femoral Nerve Stretch)
Procedure
Patient prone. Bend the knee to about 90° and then lift the thigh into hip extension while stabilising the pelvis with your other hand. Note what the patient feels and where. This combines a hip flexor stretch with the femoral nerve stretch position.
Positive Finding
Either a stretch felt at the front of the hip or thigh (hip flexor tightness), or the patient's familiar anterior thigh pain (possible upper lumbar nerve-root involvement), or low back pain as the lumbar spine is drawn into extension.
Interpretation
Record which of the three responses occurred, because they mean different things. Familiar anterior thigh pain should lead to a neurological examination of L2–L4. Back pain alone is consistent with non-specific low back pain and simply shows that extension is provocative.
Active Trunk Rotation (Sitting or Standing)
Procedure
Patient seated with feet on the floor to lock the pelvis (or standing). Ask the patient to turn the trunk to each side as far as comfortable, arms folded across the chest. Compare the two sides and note any pain.
Positive Finding
Less rotation to one side, pain at end of range, or guarded, hesitant movement.
Interpretation
A range-of-motion and pain-behaviour check, not a diagnostic test. Most trunk rotation happens in the thoracic spine, so a sitting test mainly reflects thoracic movement. Use it as a baseline and to monitor response to treatment.
⚠ Red Flags
- •Cauda equina syndrome (bilateral leg pain, progressive neurological deficit, bowel/bladder dysfunction, saddle anesthesia)
- •Severe unrelenting pain unresponsive to conservative care with systemic symptoms (fever, weight loss, night sweats)
- •Traumatic onset with severe mechanism of injury (high-energy fall, motor vehicle accident)
- •Progressive neurological deficit with dermatomal or myotomal pattern
- •Suspected infection (fever, elevated inflammatory markers, immunocompromise history)
- •Suspected malignancy (history of cancer, unexplained weight loss, night sweats, progressive symptoms)
- •Fracture suspicion (age >70, corticosteroid use, osteoporosis, severe trauma)
⚡ Yellow Flags
- •High pain catastrophizing or fear-avoidance beliefs
- •Depressed mood, anxiety, or recent significant life stress
- •Belief that pain indicates serious underlying damage or disease
- •Prolonged work absence or workers' compensation dispute
- •Excessive health-seeking behavior or medication overuse
- •Limited social support or social isolation
- •History of childhood trauma or adverse life experiences
- •Belief that activity will worsen condition (kinesiophobia)
- •Secondary gain (financial benefits, attention from family/healthcare)
- •Inconsistent behavioral patterns between reported and observed function
Osteopathic Techniques
Region
Erector spinae, quadratus lumborum, and multifidus muscles
Technique
Rationale
Direct soft tissue release addresses myofascial restrictions, muscle tension, and trigger points that perpetuate pain and limit mobility; reduces muscular splinting and improves tissue perfusion and neuromuscular efficiency.
Region
Hip flexors (iliopsoas, rectus femoris), hip extensors, and adductors
Technique
Rationale
Muscle energy techniques restore balanced muscular tension and address hip and pelvic restrictions that contribute to compensatory lumbar loading; MET respects patient barrier and uses active muscular contraction to improve proprioceptive awareness and neuromuscular control.
Region
Sacroiliac joint and surrounding ligaments
Technique
Rationale
Gentle articulation of the sacroiliac joint restores segmental mobility, reduces sacroiliac dysfunction-related pain, and promotes normal load distribution across the lumbosacral region.
Region
Abdominal and pelvic fasciae
Technique
Rationale
Lymphatic drainage techniques reduce inflammatory congestion in the lumbar region, improve tissue fluid balance, and support parasympathetic activation to reduce pain perception and promote healing.
Region
Occipital base, cervical spine, and solar plexus
Technique
Rationale
Cranial and fascial release techniques address central tension patterns, modulate autonomic nervous system function to reduce sympathetic dominance and pain hypervigilance, and improve overall tissue resilience through parasympathetic stimulation.
Rehabilitation Exercises
Lumbar flexion-extension movements (standing or seated)
Piriformis stretch (figure-4 or lying cross-leg)
Hip flexor stretch (low lunge or Thomas position awareness)
Transverse abdominis activation (lying supine with abdominal drawing-in)
Bridging with glute activation (supine hip extension)
Quadruped rocking or bird dogs (alternating limb extension)
Dead bug exercise (alternating limb extension in supine)
Side-lying clamshells with hip abduction
Standing lumbar stabilization against wall with pelvic tilt awareness
Single-leg stance or tandem walking for proprioceptive awareness
Planks or modified planks with trunk co-contraction
Walking, swimming, or cycling for aerobic conditioning and activity tolerance
Referral Criteria
- •Presence of red flag features (cauda equina syndrome, infection, malignancy, fracture, progressive neurological deficit)
- •Persistent symptoms unresponsive to conservative care after 6-8 weeks
- •Significant psychosocial barriers to recovery (depression, anxiety, catastrophizing, kinesiophobia) requiring mental health intervention
- •Neurological examination findings consistent with nerve root compression or myelopathy requiring imaging and specialist assessment
- •Suspected sacroiliac joint dysfunction or other specific mechanical pathology requiring advanced imaging
- •Work-related or complex chronic pain presentation requiring interdisciplinary pain management approach
- •Need for epidural corticosteroid injection or surgical consultation after conservative management failure
- •Significant functional impairment or disability affecting occupational or social capacity
Evidence Grade Key