Joint guide
Thumb MCP joint
The thumb’s knuckle where the long thumb bone meets the first thumb segment. It flexes and extends and works with the CMC for pinch arcs.
Diagram
Schematic for orientation — not a substitute for imaging or an in-person exam.
Related anatomy topics
Sources & further reading
We cite major society patient education, NIH institute pages, and MedlinePlus for naming and general joint context. Links open in a new tab; access dates help you judge currency when guidelines update.
- Arthritis of the hand — OrthoInfo — American Academy of Orthopaedic Surgeons(accessed 2026-04-24)
- Hand and wrist anatomy — American Society for Surgery of the Hand(accessed 2026-04-24)
- Hand injuries and disorders — MedlinePlus (U.S. National Library of Medicine)(accessed 2026-04-24)
Sessions and movement names for this joint
These buttons open the exercise and movement libraries with filters cleared for exploration — still not individualized medical advice.