Which physical examination finding is consistent with a herniated disk at L5-S1?

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Multiple Choice

Which physical examination finding is consistent with a herniated disk at L5-S1?

Explanation:
Disk herniation at L5-S1 classically compresses the S1 nerve root as it exits below L5. The Achilles reflex, or ankle jerk, is mediated mainly by the S1 nerve root; when S1 is affected, this reflex is diminished or absent. Sensory changes from S1 radiculopathy typically involve the posterior calf and lateral side of the foot, not the medial thigh or groin. An upgoing Babinski sign points to an upper motor neuron issue rather than a focal nerve root compression. Sensation loss in the groin or medial thigh maps to higher lumbar or different nerve distributions (L1–L2 or L2–L4 via the obturator/iliohypogastric–ilioinguinal nerves), not S1. So the absent ankle reflex best fits an L5–S1 disk herniation.

Disk herniation at L5-S1 classically compresses the S1 nerve root as it exits below L5. The Achilles reflex, or ankle jerk, is mediated mainly by the S1 nerve root; when S1 is affected, this reflex is diminished or absent. Sensory changes from S1 radiculopathy typically involve the posterior calf and lateral side of the foot, not the medial thigh or groin. An upgoing Babinski sign points to an upper motor neuron issue rather than a focal nerve root compression. Sensation loss in the groin or medial thigh maps to higher lumbar or different nerve distributions (L1–L2 or L2–L4 via the obturator/iliohypogastric–ilioinguinal nerves), not S1. So the absent ankle reflex best fits an L5–S1 disk herniation.

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