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anterior interosseous nerve palsy
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The anterior interosseous nerve is a branch of the median nerve in the forearm.

It is purely motor and supplies:

  • flexor digitorum profundus - flexes distal phalanges of index and middle fingers
  • flexor pollicus longus - flexes thumb
  • pronator quadratus muscle - pronates hand

Damage may occur without any obvious cause or may develop as a result of external pressure on the forearm or from gripping tightly in association with pronation.

Recovery usually occurs spontaneously over 2 - 3 months. Exploration is indicated if the injury persists.