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Review Question - QID 6229

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QID 6229 (Type "6229" in App Search)
Following ankle arthroscopy performed through a posterolateral portal, a patient notes numbness on the lateral half of the heel pad of the foot. What is the most likely injured structure?

Sural nerve

50%

97/194

Lateral plantar nerve

9%

17/194

Lateral calcaneal nerve

34%

65/194

First branch of the lateral plantar nerve

7%

14/194

Deep peroneal nerve

0%

0/194

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The lateral calcaneal nerve is a branch of the sural nerve that runs along the lateral border of the Achilles tendon to innervate the lateral heel pad. Ankle arthroscopy involves posterior portals that hug the Achilles tendon to avoid the main trunks of the sural nerve and tibial nerve; however, the lateral calcaneal branch remains potentially vulnerable. The first branch of the lateral plantar nerve is actually a medial structure that partially innervates the plantar fascia and the abductor digiti quinti. The deep peroneal nerve is anterior to the ankle.

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