Entrapment Neuropathies

Question 1

What muscles are affected in carpal tunnel syndrome?

Answer 1

lumbricals 1 and 2, opponens pollicis, and abductor and flexor pollicis brevis (LOAF) muscles

Question 2

What separates pronator teres syndrome from carpal tunnel syndrome symptomatically?

Answer 2

Absence of nocturnal exacerbation and presence of palm numbness in pronator teres syndrome

Question 3

What is the anterior interosseous nerve?

Answer 3

Motor branch of median nerve innervating flexor digitorum profundus 1 and 2, flexor pollicis longus, and pronator quadratus

Question 4

What is the symptomatology of AIN syndrome?

Answer 4

motor weakness, no sensory loss (manifests with “pinch sign”

Question 5

What are four entrapment locations for the median nerve?

Answer 5

1. Carpel Tunnel
2. Pronator teres
3. Struther’s ligament
4. AIN

Question 6

What are four entrapment locations for the ulnar nerve?

Answer 6

1. Arcade of Struthers (upper arm)
2. Elbow
3. Cubital tunnel
4. Guyon canal (sensation intact)

Question 7

What are four entrapment locations for the radial nerve?

Answer 7

1. Axilla
2. Spiral groove
3. PIN (arcade of Frohse)
4. Radial Tunnel

Question 8

Entrapment of radial nerve at the spiral groove causes _____.

Answer 8

wrist drop without triceps involvement

Question 9

PIN syndrome causes _____.

Answer 9

finger extension weakness without wrist drop or sensory deficits

Question 10

What is meralgia paresthetica? What are the symptoms? Treatment?

Answer 10

lateral femoral cutaneous nerve entrapment

burning dysesthesia in lateral/upper thigh (purely sensory branch—L2, L3)

conservative treatment though surgery can be done

Question 11

Seeing both thenar and hypothenar atrophy should be a red flag for what syndrome?

Answer 11

neurologic thoracic outlet syndrome