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Old 10-31-2011
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Question Kicked in lateral knee

A 19-year-old male was kicked in the lateral knee while playing soccer. He presents to the emergency room with decreased sensation in the anterolateral aspect of his leg and dorsum of his foot. Which of the following functions will be absent in his leg?

A. Plantarflex ankle
B. Plantarflex foot
C. Inversion of foot
D. Flex toes
E. Dorsiflex foo
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E. Dorsiflex foot
comon peroneal n paralysis
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The correct answer is E.
A common peroneal nerve injury can be caused by a direct blow to the lateral aspect of the leg or fibula neck fracture. The patient is unable to evert or dorsiflex the foot and canít extend the toes. There is also a sensory loss in the anterolateral leg and dorsal aspect of foot. Inversion, flexion of toes, and plantarflexion of the ankle and foot are innervated by the tibial nerve.
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