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Lumbar radiculopathy (sciatica) without red flags — MSRA MCQ

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ModerateMRILumbar radiculopathy (sciatica) without red flagsMSRA

A 52-year-old man consults his GP with 9 weeks of left-sided low back pain radiating from the buttock to the lateral calf and dorsum of the foot. The leg pain is worse than the back pain. He has had no trauma, fever, weight loss or history of malignancy. He reports no perineal numbness, urinary retention, faecal incontinence or sexual dysfunction. Examination shows normal gait, power, reflexes and sensation in both lower limbs. Straight-leg raising reproduces his leg pain at 40 degrees on the left. Despite regular ibuprofen with gastroprotection and remaining active, pain is disturbing sleep and he has been unable to work for 3 weeks. He asks for an MRI because a colleague had a prolapsed disc. What is the most appropriate next management plan?

Educational content. Not a substitute for clinical judgement or local policy.

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Correct answer: E — Refer for specialist musculoskeletal or spinal assessment without requesting lumbar MRI in primary care

Explanation lettering: C = shown as A · E = shown as B · B = shown as C · A = shown as E

This is lumbar radiculopathy (sciatica): leg-dominant pain in an L5 distribution with a positive straight-leg raise. He has no features requiring emergency assessment for cauda equina syndrome, including new bladder, bowel or sexual dysfunction or perineal sensory loss, and has no systemic red flags for serious spinal pathology. His symptoms have persisted beyond 6 weeks, are inadequately controlled with analgesia and are disabling, so referral for specialist assessment is appropriate. However, NICE advises against routine imaging requested by non-specialist services for low back pain with or without sciatica. In a specialist setting, imaging is considered only where its result is likely to alter management; an MRI is therefore not a prerequisite to referral. B is attractive because MRI may subsequently demonstrate disc prolapse and inform a surgical opinion, but it is not the appropriate GP-initiated next step. C would be reasonable for stable, non-disabling symptoms controlled with analgesia. D would be correct if new sphincter disturbance, sexual dysfunction or perineal numbness suggested cauda equina syndrome. E is not useful for uncomplicated radicular symptoms and does not replace specialist-directed imaging.

Reference: NICE NG59: Low back pain and sciatica in over 16s: assessment and management — Recommendations (2016; updated 11 December 2020) — https://www.nice.org.uk/guidance/ng59/chapter/Recommendations NICE NG127: Suspected neurological conditions: recognition and referral — Recommendations for adults aged over 16 (2019) — https://www.nice.org.uk/guidance/ng127/chapter/recommendations-for-adults-aged-over-16