Erb’s Paralysis

ERB’S PARALYSIS

Q. 1

In injury to upper trunk of the brachial plexus following is/are seen:

 A

Supination of forearm

 B

Pronation of forearm

 C

Inability to initiate abduction of shoulder

 D

b & c

Q. 1

In injury to upper trunk of the brachial plexus following is/are seen:

 A

Supination of forearm

 B

Pronation of forearm

 C

Inability to initiate abduction of shoulder

 D

b & c

Ans. D

Explanation:

B i.e. Pronation of forearm; C i.e. Inability to initiate abduction of shoulder

Erb’s palsy presents with policeman or porter or waiter’s tip deformityQ i.e. adducted & medially rotated arm; and pronated & extended forearmafter injury to upper C5 & C6 roots of brachial plexusQ usually following blow or fall on shoulder and deliveni (i.e. excessive displacement of head to opposite side & depression of shoulder on same side causing avulsion of upper roots of brachial plexus) leading to paralysis of MusculocutaneousQ, AxillaryQ, Nerve to SubclaviusQ, & Suprascapular nerveQ (Mnemonic – “MANS”)

Nerve root supply of both brachioradialis & coracobrachialis is C5 6 7. But the brachioradialis is supplied by radial nerve and coracobrachialis by musculo cutaneous nerve. As in Erb’s paralysis (tearing of C5, C6 roots) mainly damaged nerves are – musculo cutaneous, axillary, suprascapular & nerve to subclavius. My answer of choice is brachioradialis.

Klumpke’s paralysis occurs due to injury to lower trunk (mainly T1 & partly C8) of brachial plexusQ leading to, homer’s syndromeQ, claw hand & cutaneous anesthesia in narrow zone along ulnar nerve.


Q. 2

Which of the following deformity is evident in case of erbs palsy?

 A

Policeman tip deformity

 B

Winging of scapula

 C

Claw hand

 D

Wrist drop

Q. 2

Which of the following deformity is evident in case of erbs palsy?

 A

Policeman tip deformity

 B

Winging of scapula

 C

Claw hand

 D

Wrist drop

Ans. A

Explanation:

Ans. is ‘a’ i.e., Policeman tip deformity


Q. 3

Upper limb deformity in Erb’s palsy?

 A

Addduction and lateral rotation of arm

 B

Addduction and medial rotation of arm

 C

Abdduction and lateral rotation of arm

 D

Abdduction and medial rotation of arm

Q. 3

Upper limb deformity in Erb’s palsy?

 A

Addduction and lateral rotation of arm

 B

Addduction and medial rotation of arm

 C

Abdduction and lateral rotation of arm

 D

Abdduction and medial rotation of arm

Ans. B

Explanation:

Deformity in Erb’s palsy (position of the limb):

  • Arm: Hanges by the side; it is adducted & medially rotated
  • Forearm: Extended and pronated
  • The deformity is known as ‘policeman’s’ tip hand or ‘porter’s tip hand’


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