0 of 5 questions completed
You have already completed the quiz before. Hence you can not start it again.
Quiz is loading…
You must sign in or sign up to start the quiz.
0 of 5 questions answered correctly
Time has elapsed
You have reached 0 of 0 point(s), (0)
Earned Point(s): 0 of 0, (0)
0 Essay(s) Pending (Possible Point(s): 0)
- Neurological 0%
Gold standard case presentation
Common peroneal nerve palsy
This is also commonly known as foot drop, but it is not the only cause. The physical signs include wasted lateral leg muscles (if chronic) and ankle dorsiflexion and eversion weakness. Some textbooks also report a sensory impairment over the lateral calf and dorsum of the foot, but this is inconsistent in the literature and unclear if of clinical significance. If there is any weakness of ankle inversion then this indicates that the lesion is higher than the common peroneal nerve.
Be sure to not miss the gait correcting callipers which may be somewhere around the bedside. A common error among candidates is to not take mental note or then convey to the examiners what has been seen around the bed side. As a result, candidates often miss vital clues that would help determine the diagnosis!
Other clinical signs include an intact ankle reflex. The common peroneal nerve and the tibial nerve are the two branches of the sciatic nerve, and as the latter converts the ankle refle, in a common peroneal nerve palsy it is spared. This helps differentiate peroneal nerve palsy from conditions that lead to an absent ankle reflex (S1 radiculopathy, complete sciatic nerve lesion or a rare tibial nerve lesion).
Other causes of foot drop include: a partial sciatic nerve lesion; radiculopathies of L4 or L5 or HSMN.
The most common cause of common peroneal nerve damage is trauma to the neck of the fibula, plaster casts, or, especially in women, frequent and prolonged leg crossing. In addition systemic disease, such as diabetes mellitus and vasculitides which cause widespread nerve damage as well as leprosy may lead to this clinical sign.
- Review / Skip
Question 1 of 5
1. Question1 point(s)Category: Neurological
Does this patient exhibit central or peripheral neurological signs?CorrectIncorrect
Question 2 of 5
2. Question1 point(s)Category: Neurological
What best describes this patient’s gait?CorrectIncorrect
Question 3 of 5
3. Question1 point(s)Category: Neurological
Which of the following peripheral nerves is most likely damaged in this patient?CorrectIncorrect
Question 4 of 5
4. Question1 point(s)Category: Neurological
What is the commonest cause of injury to the common peroneal nerve?CorrectIncorrect
Question 5 of 5
5. Question1 point(s)Category: Neurological
Which investigation would be most useful to confirm a diagnosis of common peroneal nerve injury?CorrectIncorrect