CMC Grind Test
- CMC Grind Test is used to assess the integrity of the thumb CMC joint
- 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.
- 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: 42 %
- Specificity: 80 %