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Thumb CMC Grind Test

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Other Names

Thumb CMC Grind Test
Demonstration of thumb CMC grind test[1]
  • 1st CMC Grind Test
  • CMC Grind Test
  • Thumb Grind Test
  • Thumb basilar joint grind test



  • The patient is seated or standing
  • Examiner grips the patients metacarpal bone of the thumb and apply an axial load
  • You can move in gentle circles
  • Positive test
    • Pain
    • Crepitus



Carpometacarpal Arthritis

  • Model et al[2]
    • Sensitivity: 30% - 53%
    • Specificity: 80% - 96.7%

See Also


  1. Image courtesy of ortho eval, https://www.youtube.com/watch?v=N59aW2Xn2ZI
  2. Model, Z., Liu, A. Y., Kang, L., Wolfe, S. W., Burket, J. C., & Lee, S. K. (2016). Evaluation of Physical Examination Tests for Thumb Basal Joint Osteoarthritis. Hand (New York, N.Y.), 11(1), 108–112. http://doi.org/10.1177/1558944715616951
Created by:
John Kiel on 13 August 2019 03:41:58
Last edited:
25 May 2023 06:24:40