Anatomy of the 1st CMC Joint The 1st Carpo-meta-carpal (CMC) joint is more commonly referred to as the thumb joint. It is located at the base of the thumb between the carpal bones and the metacarpal bones. It is classified as a saddle joint, meaning it allows the thumb to move freely in many directions. As a result of this mobility, you can perform a wide variety of complicated tasks such as opening a jar, pinching an object, writing, and holding differently shape objects. What is Thumb Arthritis? Arthritis is a general condition that can affect any joint in the…
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