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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 muscles are attached to the base of the fingers and run through the palm of the hand to the extensor mechanism. The ulnar nerve relays messages from the brain to control the movement of the forearm and hand. Extension of the IP joints and flexing of the MCP joints in the hand are controlled by these muscles. These signals trigger movement of the palmar interossei (hand) muscles, and cause the palm and fingers to adduct, or draw forward. Back to Hand.