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2256 pages added, reviewed or updated during the last month (last updated: 20/4/2021)


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features of an ulnar nerve lesion at the elbow

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The clinical features of an ulnar nerve lesion at the elbow include:

  • wasting of the flexor carpi ulnaris and the ulnar half of the flexor digitorum:
    • is apparent on the inner aspect of the flexor surface of the forearm
    • weakness of flexor carpi ulnaris causes the hand to deviate to the radial side as the wrist is flexed

  • wasting of the small muscles of the hand except the thenar eminence and the first two lumbricals

  • clawing of the ring and little fingers (main en griffe):
    • loss of the 3rd and 4th lumbricals and all the interossei results in:
      • hyperextension of the metacarpophalangeal joints
      • flexion of the interphalangeal joints

  • paralysis of the hypothenar muscles:
    • abolishes abduction of the little finger

  • paralysis of the interossei:
    • abolishes abduction and adduction of the fingers

  • paralysis of the adductor pollicis:
    • weakens adduction of the thumb which is most evident when a piece of paper is grasped in a pincer grip between thumb and index finger (Froment's sign)

  • numbness and tingling:
    • over the two ulnar fingers and the ulnar border of the palm

Last reviewed 01/2018

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