CMC Grind Test

 CMC Grind Test

What is CMC Grind Test?

  • CMC Grind Test is used to assess the integrity of the thumb CMC joint

How it's Performed?

  • The grind test is performed by gripping the patient’s metacarpal bone of the thumb and moving it in a circle and loading it with gentle axial forces.

What does a positive CMC Grind Test mean?

  • A patient with thumb joint arthritis generally complains of a sudden sharp pain at the CMC joint which can also be associated with Crepitus
  • This indicates a positive test

Sensitivity & Specificity

  • Sensitivity: 42 %
  • Specificity: 80 %


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