Erb’s Paralysis

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.

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

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’