![]() The CMC joint is located where the thumb (metacarpal) bone meets the wrist (carpal) bone.Īs this joint becomes worn, often due to age, it can lead to a painful condition called thumb arthritis (also known as CMC arthritis or basal joint arthritis). You use your thumb to grasp and pinch objects, open jars, play the guitar, dress yourself, operate tools, and perform countless other tasks.Īnd even if you do appreciate your thumb, you might not be aware of how the first carpometacarpal or “CMC” joint helps it do its job. You may not think much about your thumb-after all, it’s a digit and not even a finger-but it plays an important role in your everyday life.
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