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MediumNeurologySciatica / Lumbar Radiculopathyukmlamrcgp aktpanemrcp part 1

A 26-year-old man presents with acute onset low back pain radiating down his left leg to the foot, associated with numbness on the sole of his foot and difficulty plantarflexing the ankle. The pain started after lifting a heavy box. Straight leg raise test is positive on the left at 40 degrees. What spinal nerve root is most likely affected?

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