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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.
The thumb has two bones. The first bone (distal phalange) extends from the tip of the thumb to the knuckle. The second bone (proximal phalange) extends from the knuckle to the base of the thumb. This is the area of webbing between the thumb and the first finger. The thumb connects with a bone in the hand (first metacarpal).