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Pollocks Test

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Other Names

  • Pollock's Sign
  • Nail File Sign


Demonstration of Pollock's Test[1]


  • Ask the patient to place their hand in a supinated position on a flat surface, with all fingers extended
  • Isolate the DIP joint of the 4th, 5th digits by restricting motion to the MP and proximal interphalangeal (PIP) joints.
  • Ask the patient to flex while applying a resistive force.
  • Observe the patient’s ability to flex the DIP joint of the little finger against resistance.
  • Positive test
    • Inability to flex the DIP joints of the ring and little fingers.



  • Unknown

See Also


  1. Goldman, Sarah B., et al. "A review of clinical tests and signs for the assessment of ulnar neuropathy." Journal of hand Therapy 22.3 (2009): 209-220.
  2. Pollock, Lewis J. "Supplementary muscle movements in peripheral nerve lesions." Archives of Neurology & Psychiatry 2.5 (1919): 518-531.
Created by:
John Kiel on 30 December 2019 23:01:14
Last edited:
27 April 2023 10:05:00