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What is the thumb IP joint and what problems occur? The IP joint is the end joint of the thumb. It is shaped as a double dome side by side on the hand side of the joint and two side by side matching shallow curves on the nail side. This allows mobility in bending and straightening but stability in sideways and twisting movements.
In each movement, the thumb plays an integral part. Without cooperation from this key digit, squeezing and gripping motions would be virtually impossible. Over time, though, even the thumb can reach its limits. The basal joint or carpometacarpal joint (CMC)âlocated at the base of the thumbâallows these crucial swiveling and pivoting motions. But because sophisticated movements depend on this joint, itâs susceptible to wear-and-tear from normal use. And when the CMC joint wears down, arthritis can develop and hinder even the easiest functions.