A 30-year-old software engineer has acute L4-L5 disc herniation with right L5 radiculopathy causing foot drop (MRC grade 3). Pain has not responded to 3 weeks of conservative management. Which finding mandates urgent surgical discectomy rather than continued conservative management?

• A Continuing pain despite 3 weeks of analgesia
• B Positive straight leg raise at 30°
• C MRI showing disc herniation >5 mm beyond the posterior annulus
• D Progressive neurological deficit — worsening motor deficit to MRC grade 2 or below during observation ✓

Explanation

Indications for urgent discectomy include: cauda equina syndrome, progressive neurological deficit (worsening motor power during observation, which signals ongoing cord/root compression), and severe unremitting pain despite adequate analgesia. An MRC grade 3 foot drop that is static can be managed conservatively for 6 weeks as acute nerve root compression often recovers with resorption of the disc. Progressive worsening of motor function (MRC 3→2 or lower) indicates irreversible axonal injury is occurring and mandates immediate decompression. MRI disc size and positive SLR are diagnostic but not surgical indications alone.

Reference: Maheshwari Essential Orthopaedics, 6th ed.

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Written and medically reviewed by the StethoPrep medical team.