Sciatica
Lower LimbOverview
Sciatica is a neuropathic syndrome characterized by pain, numbness, or tingling radiating along the sciatic nerve distribution, typically from the lower back through the buttock and down one leg. The condition results from compression or irritation of the sciatic nerve roots, most commonly at the lumbar spine or through the piriformis muscle. Most cases resolve within 4-6 weeks with conservative management, though some may develop chronic symptoms.
Pathophysiology
Sciatica occurs when the sciatic nerve (L4-S3 nerve roots) becomes compressed or irritated. Common causes include herniated intervertebral discs pressing on nerve roots, lumbar spinal stenosis, piriformis muscle tightness causing nerve entrapment (piriformis syndrome), facet joint arthrosis, spondylolisthesis, or sacroiliac joint dysfunction. Inflammation around the nerve root and mechanical nerve root irritation trigger neuropathic pain signals that radiate distally along the sciatic nerve distribution. Prolonged compression can lead to nerve ischemia, demyelination, and potentially permanent neurological deficit if untreated.
Patient Education
Understanding that sciatica is usually a mechanical problem that responds well to movement and activity (rather than requiring complete rest) helps patients engage with rehabilitation and avoid chronicity; staying active within pain tolerance, maintaining good posture, and addressing underlying spinal mechanics are key to recovery.
Typical Presentation
Site
Lower back (L4-S1 region), buttock, lateral and posterior thigh, lateral calf, and dorsum of foot; typically unilateral but can be bilateral
Quality
Sharp, burning, or shooting pain; numbness; tingling; pins and needles sensation; may describe as electric or stabbing
Intensity
Highly variable, ranging from mild discomfort to severe debilitating pain; often worse in morning or evening; may fluctuate throughout the day
Aggravating
Prolonged sitting or driving; forward bending; coughing or sneezing; heavy lifting; straining; certain leg positions; prolonged static postures
Relieving
Walking or light activity; lying down with knees bent; heat application; standing; certain positions that reduce nerve tension (hip flexion)
Associated
Loss of ankle reflexes (if S1 involved); foot drop (if L5 involved); lower back pain; buttock pain; weakness in leg or foot; difficulty walking or climbing stairs; muscle atrophy (chronic cases); postural dysfunction
Orthopaedic Tests
Straight Leg Raise (SLR) Test
Procedure
Patient supine; examiner passively flexes the hip with knee extended until pain or limitation is encountered. Note the angle of hip flexion at which symptoms occur.
Positive Finding
Reproduction of radicular pain (shooting pain down the leg) or significant limitation in hip flexion (typically <60°), especially if pain radiates below the knee
Sensitivity / Specificity
91% / 26%
Majlesi et al., 2008, Spine
Interpretation
Highly sensitive for nerve root tension and disc herniation but low specificity; a negative SLR makes significant nerve root involvement less likely. Pain must be radicular in nature (not just hamstring tightness) for clinical significance.
Crossed Straight Leg Raise (Contralateral SLR) Test
Procedure
Patient supine; examiner passively flexes the contralateral (opposite side) hip with knee extended. Note whether ipsilateral radicular symptoms are reproduced.
Positive Finding
Reproduction of radicular pain on the affected (non-raised) side when the opposite leg is raised
Sensitivity / Specificity
29% / 88%
Majlesi et al., 2008, Spine
Interpretation
Low sensitivity but high specificity; a positive test is highly suggestive of disc herniation with nerve root compression on the symptomatic side. Rarely positive but clinically significant when present.
Lasègue's Test (SLR with Dorsiflexion)
Procedure
Patient supine; examiner raises the straightened leg and, if pain is reproduced, dorsiflex the ankle. Relief of radicular pain with dorsiflexion suggests neural involvement.
Positive Finding
Reproduction of radicular pain with hip flexion that is reduced or abolished when the ankle is dorsiflexed
Sensitivity / Specificity
See current literature / See current literature
Interpretation
Helps differentiate neural (sciatic nerve tension) from musculoskeletal causes of leg pain. Relief with dorsiflexion suggests sciatic or tibial nerve involvement.
Slump Test
Procedure
Patient seated with knees extended; examiner flexes the thoracic spine and neck (flexing the head toward the chest), then extends one knee. Note reproduction of symptoms and whether neck extension relieves them.
Positive Finding
Reproduction of radicular or referred leg pain in the slumped position that is reduced or relieved when the neck is extended (neck extension relieves symptoms)
Sensitivity / Specificity
84% / 83%
Reiman et al., 2013, BJSM; Rebmann & Auerbach, 2003, Spine
Interpretation
Good overall sensitivity and specificity for neural tension dysfunction. Particularly useful for assessing entire spinal canal involvement and differentiating neural from non-neural causes.
Prone Knee Bend (Femoral Nerve Stretch) Test
Procedure
Patient prone; examiner flexes the knee, bringing the heel toward the buttock. Note reproduction of anterior thigh or referred pain and any hip extension limitation.
Positive Finding
Reproduction of anterior thigh pain, radicular symptoms, or significant limitation in knee flexion (inability to flex knee comfortably)
Sensitivity / Specificity
See current literature / See current literature
Interpretation
Primarily tests femoral nerve root tension (L2–L4). In sciatica, a positive test may indicate upper lumbar nerve root involvement or combined lumbar pathology affecting multiple nerve roots.
Neurological Examination (Motor, Sensory, Reflex Testing)
Procedure
Assess myotomes (S1: plantarflexion, ankle jerk; L5: dorsiflexion, foot inversion; L4: knee extension, patellar reflex), dermatomes (light touch, pinprick in L4–S2 distribution), and lower limb reflexes (patellar, Achilles).
Positive Finding
Reproducible weakness in myotome distribution, sensory loss in dermatome pattern, or diminished/absent reflexes corresponding to affected nerve root level
Sensitivity / Specificity
See current literature / See current literature
Interpretation
Objective evidence of nerve root involvement; helps identify the spinal level (S1, L5, L4) responsible for sciatica. Absent or diminished Achilles reflex is classic for S1 radiculopathy.
⚠ Red Flags
- •Cauda equina syndrome (bilateral leg pain, bilateral neurological signs, saddle anesthesia, bowel/bladder dysfunction, severe progressive neurological deficit)
- •Progressive or severe neurological deficit (rapid onset weakness, foot drop)
- •Fever with spinal pain (infection)
- •Unexplained weight loss
- •History of cancer with spinal pain
- •Unrelenting night pain or pain at rest
- •Severe trauma or osteoporosis with significant spinal pain
- •Systemic illness signs (chills, rigors)
⚡ Yellow Flags
- •Long duration of symptoms (>3 months) suggesting chronicity
- •High pain catastrophizing or fear-avoidance beliefs
- •Significant functional limitation or disability
- •Depression or anxiety symptoms
- •Poor coping mechanisms or passive pain management approach
- •Work-related stress or pending litigation
- •Belief that pain equals tissue damage
- •Excessive health-seeking behavior or multiple practitioners consulted
- •Social isolation or lack of support
- •Previous failed treatments creating hopelessness
Osteopathic Techniques
Region
Lumbar spine and nerve roots (L4-S1)
Technique
MET
Rationale
Muscle energy techniques addressing paraspinal and psoas muscle tightness reduce muscular splinting around nerve roots and decrease compression; PiLA (Positional Release Indirect Large Adjustment) or post-isometric relaxation targeting lumbar muscles improves spinal mechanics and reduces nerve irritation
Region
Piriformis muscle
Technique
Soft Tissue
Rationale
Piriformis tightness is a primary cause of sciatic nerve compression; sustained pressure and myofascial release directly address the compressed nerve, reducing neuropathic symptoms and improving hip mobility
Region
Sacroiliac joint
Technique
Articulation
Rationale
SIJ dysfunction contributes to L5-S1 nerve root irritation; gentle articulation and mobilization restore joint mechanics, reduce stress on adjacent nerve roots, and improve lumbo-pelvic stability
Region
Hip extensors and lateral hip (gluteus maximus, medius, tensor fasciae latae)
Technique
Soft Tissue
Rationale
Tight hip external rotators and extensors contribute to piriformis syndrome and sciatic nerve entrapment; releasing these tissues improves hip kinematics and reduces nerve compression
Region
Lumbar spine (segmental dysfunction at L4-L5, L5-S1)
Technique
HVLA
Rationale
High-velocity low-amplitude thrust to lumbar spine corrects segmental restrictions and reduces mechanical nerve root compression; indicated when somatic dysfunction is identified and red flags excluded
Region
Thoracolumbar junction and lower thoracic spine
Technique
Articulation
Rationale
Addressing restrictions in upper lumbar chain improves spinal mechanics throughout the lumbar region and reduces compensatory stress on lower lumbar nerve roots
Add-On Approaches
Chinese Medicine
TCM views sciatica as Qi and blood stagnation in the Bladder and Gallbladder meridians; acupuncture points such as BL40 (Weizhong), GB34 (Yanglingquan), and LV3 (Taichong) may relieve pain and restore circulation; herbal remedies addressing Blood stasis and Qi stagnation complement mechanical treatment
Chiropractic
Chiropractic adjustment of lumbar spine and pelvis aims to correct vertebral subluxations and reduce nerve irritation; flexion-distraction technique may relieve disc herniation pressure on nerve roots; sacroiliac joint manipulation may reduce referred pain
Physiotherapy
Progressive strengthening of core stabilizers (transverse abdominis, multifidus), gluteal muscles, and hip stabilizers improves spinal support and reduces nerve root stress; neural tension exercises, progressive mobilization, and functional retraining restore normal movement patterns and reduce chronicity
Remedial Massage
Deep tissue massage targeting piriformis, glutes, hamstrings, and lower back musculature reduces muscular tension and myofascial restrictions; trigger point release addressing gluteal and hamstring points alleviates referred pain and restores muscle extensibility
Rehabilitation Exercises
Piriformis Stretch (supine figure-4)
Hamstring Stretch (supine knee-to-chest with knee extended)
Hip Flexor Stretch (modified Thomas stretch or kneeling lunge)
Sciatic Nerve Flossing (gentle nerve mobilization in supine)
Gluteal Bridge (double leg, progressing to single leg)
Clamshells (side-lying hip abduction with external rotation)
Transverse Abdominis Activation (dead bug progression)
Single-Leg Stance (balance and gluteal activation)
Step-ups (progressing step height and load)
Pelvic Tilts (supine and standing) to restore neutral spine
Lumbar Rotation Mobility (quadruped or supine rotation)
Walking Program (progressive duration and terrain tolerance)
Referral Criteria
- •Red flag signs suggestive of cauda equina syndrome (urgent surgical evaluation required)
- •Progressive neurological deficit (worsening weakness, foot drop, loss of sensation)
- •Failure to improve after 4-6 weeks of conservative treatment
- •Severe functional impairment limiting activities of daily living
- •Severe unrelenting pain unresponsive to conservative care (consider imaging/neurology)
- •Suspected underlying systemic disease (cancer, infection, inflammatory condition)
- •Symptoms consistent with other diagnoses (hip pathology, knee problems, vascular claudication)
- •Psychological distress or yellow flags suggesting poor prognosis (early psychology referral)
- •Imaging findings of significant disc herniation with neurological signs (neurosurgery consultation)
- •Recurrent episodes or chronic presentation (specialist pain management or neurorehabilitation)