Adductor Canal Unexpected Motor Block — FRCA Final MCQ

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HardRegional AnaesthesiaAdductor Canal Unexpected Motor BlockFRCA Final

A patient develops dense foot motor block after an adductor canal block for knee arthroplasty. Which nerve was most likely inadvertently blocked?

Educational content. Not a substitute for clinical judgement or local policy.

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Correct answer: A — Femoral nerve

Adductor canal contains only saphenous nerve, nerve to vastus medialis, posterior obturator branch. Dense motor block indicates injection was too proximal (femoral triangle level), inadvertently blocking main femoral trunk. Correct identification of adductor canal (sartorius crossing femoral artery) is essential.

Reference: BJA Education – 2023 – Adductor canal block: anatomy and complications