Thumb CMC Grind Test
Original Editor - Sharon Schumacher
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Purpose[edit | edit source]
The purpose of the Thumb CMC Grind Test is to assess the integrity of the thumb CMC joint. Reproduction of the patient's pain and crepitus is a positive test for arthrosis and synovitis. Therapists must be aware of the crank test which both evaluates the joint quality and translational laxity, the distraction test where a pain response indicates joint inflammation and volar compression of the first metacarpal base which also indicates joint inflammation.
Technique[edit | edit source]
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.
Evidence[edit | edit source]
Studies on the specificity and sensitivity of the Grind test were performed by Merrit et al using two examiners and Choa et al. The results are shown below;
|Merritt et al||42%||80%|
|Meritt et al||53%||93%|
|Choa et al||30%||96.7%|
References[edit | edit source]
- Colditz JC, Koekebakker N. (2010) A New Splint Design for the Thumb CMC Joint [White Paper] published by Nea International bv / Push Braces, Maastricht-Airport, the Netherlands, www.push.eu
- https://medisavvy.com/thumb-grind-test/ accessed online October 17th, 2017
- 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