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MBBS QUESTION #10177
Question 1
A child with a supracondylar fracture of the humerus develops weakness of thumb and index finger flexion and cannot form an 'OK' sign. Which nerve (or its branch) is most likely injured?
  • Ulnar nerve
  • Anterior interosseous branch of the median nerve✔️
  • Radial nerve
  • Musculocutaneous nerve
Correct Answer Explanation
Supracondylar fractures are the most common elbow fracture in children and classically threaten the anterior interosseous nerve (a branch of the median nerve), which supplies flexor pollicis longus and the radial half of flexor digitorum profundus — required for the 'OK sign' pinch.