Following anterior dislocation of the shoulder, apt develops weakness of flexion at elbow and lack of sensation over the lateral aspect forearm; nerve injured is -
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- Radial nerve
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- Musculocutanous nerve
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- Axillary nerve
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- Ulnar nerve
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EXP:
- The most common complication of anterior dislocation of shoulder is axillary (circumflex) nerve injury.
- There is consequent paralysis of the deltoid muscle, with a small area of anesthesia at the lateral aspect of the upper arm.
- However, in this question the sensation are lost on lateral aspect of forearm (not arm). Lateral side of forearm has sensory supply from lateral cutaneous nerve of foreaini, a branch of musculocutaneous nerve. Musculocutaneous nerve also supplies the biceps brachii (a flexor of elbow joint).
- Therefore, musculocutaneous nerve injury will cause sensory loss over lateral aspect of the forearm with weakness of flexion at elbow.
- As occasionally other branches of brachial plexus (other than axillary nerve) can also be injured, the answer of this question is musculocutaneous nerve.