The human hand has 27 joints.
These joints are distributed across the various bones of the hand, enabling a wide range of motion and dexterity. Each finger (excluding the thumb) has three bones called phalanges and three corresponding joints:
- Distal interphalangeal (DIP) joint: The joint between the distal and middle phalanges.
- Proximal interphalangeal (PIP) joint: The joint between the middle and proximal phalanges.
- Metacarpophalangeal (MCP) joint: The joint between the proximal phalanx and the metacarpal bone.
The thumb has only two phalanges and two joints:
- Interphalangeal (IP) joint: The joint between the two phalanges of the thumb.
- Carpometacarpal (CMC) joint: The joint between the thumb's metacarpal bone and the trapezium bone of the wrist.
The wrist itself consists of the radiocarpal joint connecting the radius bone of the forearm to the carpal bones of the wrist.
