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Lumbar Radiculopathy: red-flag screening for Physios

Lumbar radiculopathy is one of the most common reasons a physio sees a patient with leg pain — and one of the few back-pain presentations where missing a red flag has serious consequences. This post is a short screening framework for the first-visit assessment: what to ask, what to test, and when to refer on rather than treat. It does not replace clinical judgement, and it is not a treatment protocol — see our condition guide for management. What we mean by lumbar radiculopathy Lumbar radicu

By Ajay Bansal··3 min read·Consensus
Browse:Lumbar spineLumbar radiculopathy

Lumbar radiculopathy is one of the most common reasons a physio sees a patient with leg pain — and one of the few back-pain presentations where missing a red flag has serious consequences. This post is a short screening framework for the first-visit assessment: what to ask, what to test, and when to refer on rather than treat.

It does not replace clinical judgement, and it is not a treatment protocol — see our condition guide for management.

What we mean by lumbar radiculopathy

Lumbar radiculopathy describes radicular leg pain caused by mechanical or inflammatory irritation of a lumbar nerve root, with or without associated motor, sensory, or reflex changes in a dermatomal/myotomal pattern. The most common cause is disc-related compression at L4–L5 or L5–S1.

Differentiating it from non-specific low back pain at first contact matters because:

  • The natural history, prognosis, and patient education differ.
  • A small subset (cauda equina syndrome, severe progressive deficit, suspected serious pathology) needs urgent onward referral, not physiotherapy first.
  • Loading and movement choices differ early in care.

lumbar radiculopathy

The red flags that change your plan

Use these as triage prompts on the first visit. A single positive does not necessarily confirm pathology, but it should change the next step.

Cauda equina syndrome (emergency)

  • Saddle anaesthesia or perineal numbness
  • New urinary retention or incontinence; faecal incontinence
  • Bilateral leg neurology (sensory or motor)
  • Sexual dysfunction with new neurological symptoms

Any one of these in a patient with new low back or leg pain warrants same-day emergency referral, not a clinic appointment.

Suspected serious spinal pathology

  • Unexplained weight loss, history of cancer, or constitutional symptoms
  • Fever, recent infection, IV drug use, or immunosuppression
  • Recent significant trauma, or minor trauma in osteoporosis
  • Thoracic pain with neurology

Progressive or severe neurological deficit

  • Worsening motor weakness across visits (not just pain-limited)
  • Foot drop or marked single-myotome weakness (e.g., L4 quadriceps, L5 EHL, S1 plantarflexion)
  • Bilateral lower limb sensory or motor changes

A 5-minute screening flow

A repeatable order keeps you fast and consistent — and easier for an AI-drafted case sheet to structure cleanly:

  1. Subjective: dermatomal leg pain pattern, paraesthesia distribution, onset, aggravators (sitting, coughing/sneezing), 24-hour pattern, prior episodes.
  2. Cauda equina screen: bladder/bowel, saddle sensation, sexual function — ask directly; patients rarely volunteer.
  3. Neurology — myotomes: L2 hip flexion, L3 knee extension, L4 ankle dorsiflexion, L5 EHL, S1 plantarflexion / eversion.
  4. Neurology — dermatomes and reflexes: light touch by dermatome; patellar (L3/4) and Achilles (S1) reflexes.
  5. Neurodynamic testing: straight leg raise (L4–S1) and femoral slump (L2–L4) — note range, symptom reproduction, and structural differentiation.
  6. Pain severity and irritability: baseline NPRS, ODI or Roland-Morris if you use it.

When to refer onward, not treat

  • Same-day emergency referral: any cauda equina red flag.
  • Urgent medical referral (days, not weeks): serious pathology red flags; progressive motor deficit; severe, unrelenting pain not responding to medical management.
  • GP / specialist review: single-level neurology persisting beyond 6 weeks despite conservative care; functional decline; co-morbidities complicating management.

Outside these scenarios, the evidence supports conservative-first management, with imaging reserved for cases where it would change the plan (e.g., surgical candidacy).

Documenting it in the case sheet

Three things to capture every time, so a colleague (or your future self) can pick up the patient cleanly:

  • The red-flag checklist — including the ones you screened and ruled out, not just the positives.
  • Baseline neurology (myotome, dermatome, reflex, neurodynamic) with the date.
  • The trigger conditions for re-screen or referral (e.g., "review red flags + L5 myotome at every visit until 6 weeks").

If you use a voice-led case sheet, dictate the negatives too — they are the evidence trail if a presentation changes later.

References

  1. National Institute for Health and Care Excellence. Low back pain and sciatica in over 16s: assessment and management. NICE guideline NG59. Updated 2020. https://www.nice.org.uk/guidance/ng59
  2. Bardin LD, King P, Maher CG. Diagnostic triage for low back pain: a practical approach for primary care. Med J Aust. 2017;206(6):268–273.
  3. Verhagen AP, Downie A, Popal N, Maher C, Koes BW. Red flags presented in current low back pain guidelines: a review. Eur Spine J. 2016;25(9):2788–2802.
  4. Konstantinou K, Dunn KM. Sciatica: review of epidemiological studies and prevalence estimates. Spine. 2008;33(22):2464–2472.
  5. Greenhalgh S, Selfe J. Red Flags: A Guide to Identifying Serious Pathology of the Spine. 2nd ed. Elsevier; 2010.