Peripheral Nerve Disorder

Question 1

Peripheral Nerve Etiology

Answer 1

acute trauma or chronic repetitive trauma that involves either shear or compression forces.

Question 2

What are the different classification of a peripheral nerve injury?

Answer 2

NAN
Neuropraxia
Axonotmesis
Neurotmesis

Question 3

Neuropraxia

Answer 3

Nerve injury that causes a transient(temporary) and focal loss of function.

At this stage there is no nerve degeneration. Can last from weeks to months. Often relates to ischemia due to compressive forces.

Mildest form of nerve injury. No degeneration.

Question 4

Axonotmesis

Answer 4

Focal damage to axon, myelin, some PN connective tissue.

Seen w/ increased duration and larger amplitude compressive/traction forces. (crush injury)

Prognosis will be related to nerve injury.

Axon can grow 1 to 3mm per day or 1 inch a month

Question 5

Neurotmesis

Answer 5

severing of axon, myelin and connective tissue.
Complete loss of function, need surgery.

Question 6

Mononeuropathy

Answer 6

involved with single nerve injury

Question 7

mononeuropathy multiplex

Answer 7

involvement of 2 or more nerves without clear pattern of polyneuropathy.

Question 8

radiculopathy

Answer 8

involvement of nerve root

Question 9

plexopathy

Answer 9

involvement of brachial and lumbar plexus.