Lumbar Radiculopathy

Spine

Overview

Lumbar radiculopathy is a clinical syndrome characterized by pain, numbness, weakness, or paresthesia in a dermatomal distribution due to irritation or compression of a lumbosacral nerve root. Common causes include intervertebral disc herniation, foraminal stenosis, facet joint hypertrophy, and nerve root inflammation. The condition typically presents with radiating leg pain that may extend below the knee and is often accompanied by neurological deficits.

Pathophysiology

Lumbar radiculopathy results from mechanical compression and/or inflammatory irritation of a nerve root as it exits the intervertebral foramen. The pathological cascade may involve: (1) mechanical compression from disc material, bone spurs, or ligamentous hypertrophy narrowing the foramen or lateral recess; (2) inflammatory response with release of cytokines and neuropeptides causing sensitization of nerve root membranes; (3) altered neuronal conduction and axonal transport; (4) myelin disruption and potential demyelination in severe cases. Risk factors include disc degeneration, facet joint osteoarthritis, lumbar instability, and postural stress. The L5 and S1 nerve roots are most commonly affected due to the high mobility and load-bearing demands at the L4-L5 and L5-S1 levels.

Typical Presentation

Site

Unilateral lower limb pain in a dermatomal pattern (L3: anterior thigh and knee; L4: anterior/medial tibia; L5: lateral leg, dorsum of foot, big toe; S1: posterior/lateral leg, heel, sole of foot). Pain may radiate from the buttock or lateral hip to the foot.

Quality

Sharp, burning, electric, or stabbing pain with associated paresthesia (tingling, numbness, pins and needles). Patients often describe 'shooting' or 'shooting down' type pain.

Intensity

Highly variable; ranges from mild paresthesia to severe pain limiting function. Often worse on one side of the body. Intensity may fluctuate throughout the day.

Aggravating

Forward bending, prolonged sitting (especially with hip flexion), coughing/sneezing, Valsalva maneuver, certain postures that compress the nerve root, extension in some cases, loading activities

Relieving

Prone lying, extension exercises (McKenzie), walking, postural changes reducing foramen compression, NSAIDs, rest (short-term), lying down with knees flexed

Associated

Weakness in myotomal distribution (foot drop in L5 radiculopathy), loss of reflexes (diminished or absent patellar reflex in L4; diminished or absent ankle reflex in S1), altered sensation in dermatome, possible bowel/bladder changes if cauda equina involved, muscle atrophy with chronic compression, posturing that reduces pain (antalgic stance)

Orthopaedic Tests

Grade A+
A+ABCDNear-definitive: a result is close to conclusive on its own (likelihood ratio ≥20 or ≤0.05)
best for ruling IN (confirmation).

Femoral Nerve Stretch Test (Reverse SLR)

Procedure

Patient prone or side-lying; examiner flexes the knee and extends the hip, stretching the femoral nerve and L2–L4 nerve roots.

Positive Finding

Reproduction of anterior thigh or groin radicular pain

Sensitivity / Specificity

50% (L2–L4 roots, 25 patients)/100% (vs 29 patients with L5/S1 impingement)

Reference: Suri P, Rainville J, Katz JN, Jouve C, Hartigan C, Limke J, et al. The accuracy of the physical examination for the diagnosis of midlumbar and low lumbar nerve root impingement. Spine (Phila Pa 1976). 2011;36(1):63-73.

Interpretation

Useful for detecting upper lumbar radiculopathy (L2–L4). Complements SLR for comprehensive nerve root screening. From 54 patients who ALL had nerve-root impingement on MRI (Suri 2011): 25 at L2–L4, 29 at L5/S1. So these figures show whether the test points to an upper lumbar root rather than a lower one. They do not show whether a nerve root is affected at all. A positive test points to L2–L4; a negative test does not rule an upper root out.

Grade B
A+ABCDGood clinical value: meaningfully changes the diagnosis in one direction (LR 5–10 or 0.1–0.2)
best for ruling OUT (screening).

Slump Test

Procedure

Patient seated; spine is flexed, cervical flexion added, then knee is extended. Each position is held while monitoring for symptoms.

Positive Finding

Reproduction of radicular pain in lower limb; pain resolves with knee flexion or cervical extension

Sensitivity / Specificity

84% (38 patients with herniation)/83% (37 symptomatic patients without)

Reference: Majlesi J, Togay H, Unalan H, Toprak S. The sensitivity and specificity of the Slump and the Straight Leg Raising tests in patients with lumbar disc herniation. J Clin Rheumatol. 2008;14(2):87-91.

Interpretation

Highly sensitive for neural involvement; screens for neurodural mobility restrictions. Positive result supports but does not confirm radiculopathy. From one case-control study (Majlesi 2008) of 75 outpatients with back and/or leg pain: 38 had a disc herniation on MRI and 37 did not. The comparison patients had symptoms too, which is the fair comparison. But a herniation on MRI is not always the cause of the pain. In the same patients the straight leg raise scored 52% / 89%.

Grade C
A+ABCDModest value: a small but usable shift in probability (LR 2–5 or 0.2–0.5)
modest, supportive value.

Straight Leg Raise (SLR) Test

Procedure

Patient supine; examiner slowly raises the affected leg with knee extended while monitoring for pain. The angle at which pain is first reproduced is recorded.

Positive Finding

Reproduction of radicular pain (not just hamstring stretch) between 30–70° of hip flexion

Sensitivity / Specificity

92% (pooled, surgical populations)/28% (pooled; studies ranged 10–100%)

Reference: van der Windt DA, Simons E, Riphagen II, Ammendolia C, Verhagen AP, Laslett M, et al. Physical examination for lumbar radiculopathy due to disc herniation in patients with low-back pain. Cochrane Database Syst Rev. 2010.

Interpretation

High sensitivity makes it useful for ruling out radiculopathy; low specificity means positive result is non-specific. Pain beyond 70° suggests non-neural origin. Pooled in a 2010 Cochrane review (van der Windt) from studies where surgery confirmed the diagnosis. Those patients were already selected for surgery (58–98% had a herniation), so specificity is poorly estimated, and sensitivity was lower in studies that used imaging or were done in primary care. A negative SLR makes a disc herniation causing leg pain less likely; a positive SLR on its own proves little.

Grade C
A+ABCDModest value: a small but usable shift in probability (LR 2–5 or 0.2–0.5)
modest, supportive value.

Crossed Straight Leg Raise (Crossed SLR) Test

Procedure

Patient supine; examiner raises the unaffected leg with knee extended. Pain is assessed on the affected side.

Positive Finding

Reproduction of radicular pain on the contralateral (affected) leg

Sensitivity / Specificity

28% (pooled)/90% (pooled)

Reference: van der Windt DA, Simons E, Riphagen II, Ammendolia C, Verhagen AP, Laslett M, et al. Physical examination for lumbar radiculopathy due to disc herniation in patients with low-back pain. Cochrane Database Syst Rev. 2010.

Interpretation

Low sensitivity but very high specificity; strongly suggestive of disc herniation with nerve root compression when positive. Valuable for confirming radiculopathy. Pooled in a 2010 Cochrane review (van der Windt), mostly from surgical populations. A positive crossed SLR makes a disc herniation more likely; because it is usually negative, a negative result does not rule one out.

AI

Myotomal/Neurological Examination (Strength, Reflex, Sensation)

Procedure

Examiner tests key myotomes, tendon reflexes (patellar, Achilles), and dermatomal sensation corresponding to suspected root (L4, L5, S1).

Positive Finding

Weakness (>1 grade below contralateral), diminished or absent reflex, or sensory deficit in dermatomal distribution matching clinical history

Interpretation

Moderate to high specificity; objective neurological deficit strongly supports diagnosis and localizes nerve root level. Absence does not exclude radiculopathy. This combines many separate checks (strength, reflexes, sensation), each with its own accuracy, so no single figure applies. In a 2010 Cochrane review most of these signs performed poorly on their own. See the lumbar nerve root lesion patterns page for level-specific findings.

⚠ Red Flags

  • •Bilateral leg pain and bilateral neurological signs
  • •Saddle anesthesia (perianal/perineal numbness)
  • •Recent onset bowel or bladder dysfunction (urinary retention, incontinence, fecal incontinence)
  • •Severe progressive neurological deficit or foot drop
  • •Signs of meningitis (neck stiffness, photophobia, fever)
  • •Uncontrolled fever with night sweats
  • •History of cancer with neurological signs
  • •Acute spinal cord compression signs (hyperreflexia, Babinski sign, spasticity)
  • •Severe, unrelenting pain unresponsive to conservative care lasting >6 weeks with progressive deficits
  • •Trauma with fracture
  • •Unexplained weight loss with neurological symptoms

⚡ Yellow Flags

  • •Psychosocial distress and catastrophizing about symptoms
  • •High fear-avoidance beliefs limiting movement and rehabilitation engagement
  • •Passive coping strategies predominating over active self-management
  • •Significant psychological comorbidity (depression, anxiety) affecting pain perception
  • •Potential secondary gain or compensation-seeking behaviors
  • •Poor health beliefs and unrealistic expectations for recovery
  • •Social isolation or limited support networks
  • •Work dissatisfaction or occupational stress exacerbating symptoms
  • •Medication overuse or analgesic dependency patterns
  • •Multiple health complaints suggesting somatization

Osteopathic Techniques

Region

Lumbar spine and sacroiliac joint

Technique

MET
Grade B
Moderate evidence: supported by at least one good study

Rationale

Muscle energy techniques targeting piriformis, quadratus lumborum, and paraspinal muscles reduce muscular tension and improve segmental mobility. Releasing protective muscle spasm can decompress the affected nerve root and improve intervertebral foramen space, reducing radicular symptoms.

Region

Lumbosacral spine (L4-L5, L5-S1 segments)

Technique

Articulation
Grade D
Low evidence: expert consensus or could not be verified against literature

Rationale

Gentle, controlled articulation in flexion or extension mobilizes hypomobile segments and reduces mechanical irritation of nerve roots. Extension-based articulation may help with disc protrusion, while flexion-based techniques may ease facet-mediated stenosis, depending on mechanical presentation.

Region

Thoracolumbar and lumbar regions

Technique

Soft Tissue
Grade D
Low evidence: expert consensus or could not be verified against literature

Rationale

Targeted soft tissue release of paraspinal muscles, quadratus lumborum, and iliopsoas reduces muscular guarding, improves segmental mobility, and decreases intraspinal pressure. Myofascial release also addresses referred patterns from upper lumbar dysfunction.

Region

Sciatic nerve pathway and lower limb

Technique

Soft Tissue
Grade D
Low evidence: expert consensus or could not be verified against literature

Rationale

Targeted soft tissue mobilization along the sciatic nerve pathway, including piriformis release and fascial unwinding, reduces mechanical nerve compression and improves neural tension. Improves tissue extensibility and reduces secondary inflammation.

Region

Cranial and fascial system (meninges)

Technique

Cranial
Grade D
Low evidence: expert consensus or could not be verified against literature

Rationale

Craniosacral techniques and meningeal release address dural tension and promote cerebrospinal fluid circulation. Reducing meningeal constraint improves nerve root mobility and may decrease inflammatory response, supporting overall pain reduction in radiculopathy.

Rehabilitation Exercises

Prone Press-ups (McKenzie Extension)

Range of MotionBeginner

Piriformis Stretch (Supine Figure-4)

StretchingBeginner

Slump Stretch (Neural Mobilization)

StretchingIntermediate

Transverse Abdominis Activation (Drawing-In)

StrengtheningBeginner

Quadruped Bird-Dog (Opposite Arm/Leg Extension)

StrengtheningIntermediate

Glute Bridges with Sustained Hold

StrengtheningIntermediate

Planks (Forearm or High)

StrengtheningIntermediate

Quadruped Rocking (Hip-to-Heels)

PosturalBeginner

Single-Leg Stance with Support

BalanceIntermediate

Tandem Walking (Heel-to-Toe)

BalanceIntermediate

Walking Program (Progressive Duration)

CardiovascularBeginner

Knee-to-Chest Stretch (Supine)

Range of MotionBeginner

Referral Criteria

  • •Presence of any red flag symptoms (cauda equina syndrome, malignancy, infection)
  • •Progressive neurological deficit not improving with conservative care within 4-6 weeks
  • •Severe functional limitation or intolerable pain unresponsive to osteopathic treatment and self-management
  • •Need for imaging (MRI/CT) or specialist diagnostic assessment beyond osteopathic scope
  • •Consideration for epidural corticosteroid injection or surgical intervention (persistent severe symptoms, significant motor deficit)
  • •Significant psychological distress or yellow flags suggesting need for concurrent mental health support
  • •Symptoms suggesting central nervous system involvement beyond peripheral nerve root irritation
  • •Inadequate pain control after 6-8 weeks of conservative management
  • •Patient request for specialist medical opinion or surgical consultation
  • •Presence of systemic disease or metabolic factors complicating recovery