A 55-year-old male patient reports sharp, shooting pain from the lower back radiating down the posterior aspect of the right leg to the lateral foot. Which nerve root is most likely involved?

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✓ Correct answer: D. S1 The S1 nerve root innervates the posterior leg and lateral foot. Pain radiating along this dermatomal pattern strongly suggests S1 nerve root involvement.

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A 55-year-old male patient reports sharp, shooting pain from the lower back radiating down the posterior aspect of the right leg to the lateral foot. Which nerve root is most likely involved?

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