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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 MCP joints of the fingers may actually begin to point sideways (towards the little finger). This is called ulnar drift. Ulnar drift can cause weakness and pain, making it difficult to use your hand for daily activities. Both rheumatoid arthritis and osteoarthritis can affect the IP joints of the fingers. The IP joints may begin to flex (bend) or hyperextend (over straighten), causing characteristic finger deformities.