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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 first and largest knuckle is the junction between the hand and the fingers - the metacarpophalangeal joint (MCP). This joint commonly is injured in closed-fist activities and is commonly known as a boxer's fracture. The next knuckle out toward the fingernail is the proximal inter-phalangeal joint (PIP).