ERB’S PARALYSIS

ERB’S PARALYSIS

• One region of upper trunk (C5, C6) of the brachial plexus is called Erb’s point where six nerves meet.

• Injury at this point results in Erb’s paralysis.

• Erbs palsy affects children in a variety of ways. Some can move their hands but not their shoulder muscles. 

• Others can move their arms but have little control over their wrist and hand. 

• Yet others have no feeling or muscle control throughout their arm. It all depends on which nerves and how severely they are injured.

• The injury is due to undue separation of the head from the shoulder, which may be seen:

– Birth injury

– Fall on the shoulder

– During Anesthesia

CLINICAL FEATURES:

1. Muscles paralysed: 

• Mainly biceps brachii, deltoid, brachialis and brachioradialis.

• Partly supraspinatus, infraspinatus and supinator.

2. Deformity (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’

3. Disability: The following movements are lost-

• Abduction and lateral rotation of the arm (shoulder)

• Flexion & supination of the forearm

• Biceps & supinator jerks are lost.

• Sensations are lost over a small area over the lower part of the deltoid.

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