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In page Carpometacarpal bossing:

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Carpometacarpal boss is uncommon and there is not much scientific data. Its etiology has yet to be fully defined, but can be congenital in the form of an accessory ossicle (os styloideum) or may be acquired from trauma, repetitive use, or degenerative osteophytosis.[2] The condition usually begins to show in the 3rd or 4th decade.[citation needed]