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Anatomy of the Thumb Joint
The basal joint (also referred to as the carpometacarpal, CMC, joint) is designed in a saddle-like shape. The joint is formed by the first of the three bones in the thumb (metacarpels) and a small wrist bone (trapezium).
Causes of Pain
Cartilage normally covers the ends of these bones, providing smooth and painless interaction. Without this cartilage, rough bone-against-bone friction can cause significant discomfort and pain. Anything that causes the cartilage to degenerate can lead to this form of thumb joint pain.
Because the joint is relatively close to the body's surface, topical analgesics can be especially effective in relieving pain. Deep-penetrating ingredients such as emu oil ensure that pain relief is delivered deep into the joint where they will do the most good.