Skip to main content
OrthoVellum
Knowledge Hub

Study

  • Topics
  • MCQs
  • ISAWE
  • Operative Surgery
  • Flashcards

Company

  • About Us
  • Editorial Policy
  • Contact
  • FAQ
  • Blog

Legal

  • Terms of Service
  • Privacy Policy
  • Cookie Policy
  • Medical Disclaimer
  • Copyright & DMCA
  • Refund Policy

Support

  • Help Center
  • Accessibility
  • Report an Issue
OrthoVellum

Β© 2026 OrthoVellum. For educational purposes only.

Not affiliated with the Royal Australasian College of Surgeons.

Spine
intermediate
X-Type

Lumbar Radiculopathy - Dermatomal Patterns, Myotomes, EMG/NCS

Lumbar Spine Disorders

A 42-year-old office worker presents with 6 weeks of severe right leg pain radiating from the buttock down the posterior thigh and lateral calf to the lateral foot. Examination reveals weakness of ankle plantarflexion (MRC 4/5), absent Achilles reflex, and reduced sensation over the lateral foot. SLR is positive at 30 degrees. Regarding the clinical assessment of lumbar radiculopathy:

Mark each as TRUE or FALSE

A

This clinical presentation is consistent with S1 radiculopathy; the S1 dermatomal pattern involves t...

B

L5 radiculopathy typically presents with weakness of ankle dorsiflexion (tibialis anterior) and grea...

C

L4 radiculopathy causes weakness of ankle plantarflexion and loss of the Achilles reflex; the dermat...

D

L4 radiculopathy causes weakness of knee extension (quadriceps) and ankle dorsiflexion (tibialis ant...

E

The straight leg raise (Lasègue's test) is positive when radicular pain is reproduced at 30-70 degre...

Answer the questions to see explanations

Click T (True) or F (False) for each option