Question
A man sat cross-legged for about 30 mins. After this he was unable to dorsiflex his left foot and had loss of sensation in the web space between the big toe and the 2nd toe. He also has sensory loss on the same side of the foot after 2 hour. Which of the following was affected?
| A. |
Femoral nerve
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| B. |
Sural nerve
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| C. |
Peroneal nerve
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| D. |
Sciatic nerve
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Show Answer
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Correct Answer � C
Explanation
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Answer C) Peroneal nerve
Explanation: Common peroneal nerve winds round the fibular neck at knee joint and when a man sits cross legged for a considerable time pressure exerted on the nerve may cause nerve palsy.
Common Peroneal Nerve Palsy
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The common peroneal nerve (common fibular nerve, external popliteal nerve, lateral popliteal nerve) is a nerve in the lower leg that provides sensation and motor function to parts of the lower leg. When damaged or compressed, it can cause foot drop.
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The common peroneal nerve, about one-half the size of the tibial nerve, arises from the dorsal branches of the fourth and fifth lumbar and the first and second sacral nerves.
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It descends obliquely along the lateral side of the popliteal fossa to the head of the fibula, close to the medial margin of the biceps femoris muscle. Where the common peroneal nerve winds round the head of the fibula, it is palpable.
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It lies between the tendon of the biceps femoris and lateral head of the gastrocnemius muscle, winds around the neck of the fibula, between the peroneus longus and the bone, and divides beneath the muscle into the superficial peroneal nerve and deep peroneal nerve.
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A peroneal nerve injury (also called foot drop), is a peripheral nerve injury that affects a patient’s ability to lift the foot at the ankle.
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While foot drop injury is a neuromuscular disorder, it can also be a symptom of a more serious injury, such as a nerve compression or herniated disc
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